However, in contrary to the previous examples, we don’t use the NODUPKEY keyword. Then, we create a data step with two output data set. One with unique observations and one with the duplicate observations. Finally, we use the first keyword to move the first unique observation of the data set to the output data set …Then Run the task. With the Sorted data selected, choose the Data menu and choose Sort Data. Assign Group_1 to the Sort by Task roles. Choose the Options tab. Under 'Duplicate records', select 'Keep only the first record for each 'Sort by' group. Run the task. The resulting table will have one row for each Group_1 value with the highest Group_2 ...First, let’s keep things simple and do the imputation for just one county. The intent of the following DATA step is to impute the missing price of 2005 for the last county. DATA EXAMPLE3_WRONG; SET EXAMPLE3 (WHERE=(COUNTY=1003)); IF PRICE NE . THEN PRICE_IMPUTE = PRICE; ELSE PRICE_IMPUTE = LAG(PRICE)*1.1; RUN;Aug 5, 2020 ... 文章浏览阅读1.7w次，点赞8次，收藏52次。在SAS的DATA步中，可以使用by分组，在处理过程中会产生两个临时变量FIRST.variable和LAST.variable， ...Finding duplicates is simple with SAS "FIRST." and "LAST." expressions. Find duplicates save resources, ie, money, that can be used for other tasks. Using the FIRST. And LAST. expressions is a quick and easy way to find duplicated data. Using SAS expressions can save a lot of coding time. Author Clarence Wm. Jackson, CSQAApril 30, 2024 at 4:34 AM PDT. Listen. 1:32. A takeover of Anglo American Plc would need to be pitched at more than £30 ($37.6) per share, a higher price than BHP …Derived baseline flag, which is defined as the last non null test value before detection value. Here is SAS code,function first. and last. in SAS,is there a corresponding function in R? data T001; set aa; if .<ady<=1 and ^missing(avalc) then flag=1; run; Proc sort data=T001;by usubjid paramn flag egdtc visitnum;run; data T002;How SAS Determines FIRST. variable and LAST. variable. Example 1: Grouping Observations by State, City, and ZIP Code. Example 2: Grouping Observations by City, State, and ZIP Code. Example 3: A Change Affecting the FIRST. variable. How the DATA Step Identifies BY Groups. In the. DATA step. , SAS identifies the beginning and end of each. BY group.Re: Extracting words from a string after a specific character. Posted 02-06-2019 03:26 PM (71856 views) | In reply to kmardinian. Use INDEX () to find the first tilda and then use that number in SUBSTR (). Double check the order of t. cm = substr (comment, index (comment, '~') +1); View solution in original post. 0 Likes.FIRST. and LAST. If you use a by statement along with a set statement in a data step then SAS creates two automatic variables, FIRST.variable and LAST.variable, where variable is the name of the by variable. FIRST.variable has a value 1 for the first observation in the by group and 0 for all other observations in the by group.The FIND function in SAS searches for a specific substring in a given string or character variable and returns the position of its first occurrence. The FIND function is mostly used where any specific character, keyword, or phrase you want to identify, and/or extract. It is especially helpful when you read raw, scattered, and long text data.BYステートメントとFIRST.変数を使用して、連番を付加することができます。. BY変数の値が同じ間は連番の変数に1を加えて、値が変わったら0をセットします。. プログラム例. DATA sample; INPUT id $; CARDS; A001. A001. A002.When FIRST.month = 1 SAS has encountered the first observation in the BY group and when LAST.month = 1 SAS has uncounted the last observation. Note this code uses the WORK.PRDSALE_CDN_SOFA data set created at this beginning of this article and also applies the sort procedure to ensure the input dataset is correctly sorted before creating our BY ...To accomplish, he sorted the data on multiple columns with case_id as the first criteria. Then he sorted the data again with proc sort nodupkey by case_id to return the top record for each case_id. If his original sorting criteria is correct, he will return the most impacting sub-action for each case_id.This is a SUM statement . SAS evaluates boolean expressions to 1 (TRUE) or 0 (FALSE). So when FIRST.Y is TRUE it has a value of 1. So when this observation is the first one with this value of Y (within the current value of X) the counter is incremented by 1.We can use the following FIRST. function in SAS to assign a value of 1to the first observation for each team in the dataset: Notice that the … See moreI have previously written about using the Nodupkey Option in the example page Remove Duplicates in SAS.When we examine the PROC SORT Documentation for the Nodupkey Option, we can see that: "The Nodupkey Option checks for and eliminates observations with duplicate BY values".This means that the Sort Procedure considers only the variables in the By Statement and deletes any duplicate values.choosing the first date and last date in a dataset. Posted 12-12-2011 11:17 AM (3181 views) I am using the code suggested in one of the answers as I want to get the first and last date of a country. data get_first_and_last; set master_table; by ID Date; if first.date or last.Date then output; run; However, I still get the dates in between and I ...Hello , I am try to write code in Proc sql for below data step , but i am not getting as results in data step vs proc sql. My data step: data last_ass_dt; set all_results; by usubjid rsdt; if first.usubjid; keep usubjid rsdt; run; …The DO statement, the simplest form of DO-group processing, designates a group of statements to be executed as a unit, usually as a part of IF-THEN/ELSE statements. The iterative DO statement executes statements between DO and END statements repetitively based on the value of an index variable. The DO UNTIL statement executes statements in a DO ...4. Using Joe's example of a macro variable to specify the number of observations you want, here is another answer: do _i_=nobs-(&obswant-1) to nobs; set have point=_i_ nobs=nobs; output; end; stop; /* Needed to stop data step */. This should perform better since it only reads the specific observations you want.Using a subsetting IF statement before testing the FIRST.ID flag could have, in theory, caused a problem as it could have removed the observation where FIRST.ID is true. But since you are removing all of the observations where ID is missing it doesn't really cause any trouble. Your data step is equivalent to these other forms: Solved: Hello ...Inkatha had been boycotting the process and challenging the ANC in violent street protests. The peaceful election brought enormous relief to the country and the world. A Kenyan, Washington Okumu, alternately described as a professor or a diplomat, was credited with the negotiation. But few observers knew who he was.You can use the following methods to quickly concatenate strings in SAS. Method 1: Concatenate Strings with Space in Between. Method 2: Concatenate Strings with No Space in Between. Method 3: Concatenate Strings with Custom Delimiter. The following examples show how to use each method with the following dataset in SAS:The first operation attributed to the SAS was the arrest of Sean McKenna on 12 March 1975. ... The last major action for the SAS was a raid on East Falkland on the night of 14 June. This involved a diversionary raid by D and G Squadrons against Argentinian positions north of Stanley, ...only the first argument, source: The argument has all blanks removed. If the argument is completely blank, then the result is a string with a length of zero. If you assign the result to a character variable with a fixed length, then the value of that variable will be padded with blanks to fill its defined length. the first two arguments, source ...3. Let's save aside the trtsdt and trtstm when we are on a first.id row. if first. id then do; trtsdt = datepart( stdtc); trtstm = timepart( stdtc); end; 4. Let's then save the trtedt/trtetm when we're on a last.id row, and output that row. if last. id then do; trtedt = datepart( stdtc);Generate an .rtf file using the TAGSETS.RTF statement and place titles on the first page and footnotes on the last page using ODS TEXT= statements. Format the text strings to mimic the look of titles and footnotes.Check if name has first and last name. There is a column Customer name with first and last names together. not all the values have both first and/or last names. Want to know how many of them truly have both first and last names. They are separated by spaces.Hi @singhsahab, You can also use the SCAN function to extract the last "word" (second argument -1) of the string, treating all non-digit characters as delimiters (fourth argument 'kd', third argument empty). data want; set have; string=scan(string,-1,,'kd'); run; View solution in original post. 8 Likes.The %SUBSTR and %QSUBSTR functions produce a substring of argument, beginning at position, for length number of characters. %SUBSTR does not mask special characters or mnemonic operators in its result, even when the argument was previously masked by a macro quoting function. %QSUBSTR masks the following special characters and mnemonic operators ...Gumtree SA is a popular online marketplace where individuals can buy and sell items. With its wide reach and user-friendly interface, it has become a go-to platform for many South ...Special Functions and CALL Routines: Matrix CALL Routines. Special Functions and CALL Routines: C Helper Functions and CALL Routines. Special Functions and CALL Routines: Other Functions. Functions for Calling SAS Code from Within Functions. The FCmp Function Editor. Examples: FCMP Procedure. The FONTREG Procedure.When it comes to recycling, finding convenient locations is crucial. SA Recycling is a leading recycling company with various locations across the United States. Whether you have m...Inkatha had been boycotting the process and challenging the ANC in violent street protests. The peaceful election brought enormous relief to the country and the …1. 3. 3. And I want to find the first and last non-missing observation (var) for each stn so that I could know the nonmissing var for each stn is from what time to when. What I means is, in this example, I want to find for stn 1 the first is in 12/29/2000 and the last is 1/2/2001. And for stn 2, the first is 01/01/2001, and the last is 01/03/2001.If the first Def_type of the account is called 'Loss', then I'll pick the value of that date (ex. $3500 for account 1001) regardless what status the later dates have. However if the first value of the account is called 'Fee', then I'll pick the last value (ex. $40 for account 1003) regardless what status the later dates have.Hello, I have a SAS query that has been giving me trouble for quite some time (I am using SAS 9.4). I hope that the SAS community user groups can help. I have a data set that contains ID, Location, start date, end date and the difference between the first end date and the next end date. For the ...array my_name[3] $ first middle last; By default, array variables or other elements in the array have a length of 8 bytes. To specify a different length, include the desired length after the $ for character arrays and after the brackets for numeric arrays, as shown in these statements: array name[3] $10 first last middle;SAS® 9.4 Functions and CALL Routines: Reference, Fifth Edition documentation.sas.com ... In a DATA step, the default length of the target variable for the FIRST function is 1. The FIRST function returns a string with a length of 1. ... Last updated: September 14, 2023. English.Hello, I need a macro variable that I can put in the filter to put my date between the first and last day of the previous month. For example, I want to take a column of some table and in a filter to put that column and between &first_day_previous_month and &last_day_previous_month Example: ...Comparisons. The PRXCHANGE function is similar to the CALL PRXCHANGE routine except that the function returns the value of the pattern-matching replacement as a return argument instead of as one of its parameters. The Perl regular expression (PRX) functions and CALL routines work together to manipulate strings that match patterns.For your first question, the issue is that you can only alter the page numbers at a procedure break. So normally, if you are creating PDF output, you do the "first page" with the NONUMBER option in effect; and then you have a second step that does the report for all subsequent rows using a combination of FIRSTOBS= and NUMBER and PAGENO=2 values ...These keywords identify the first and last record in the grouping variable indicated after the BY statement. When an employee ID is unique, the first and last record will be the same row. Thus our code outputs employee ID's where the first and last records are not the same, to a dataset called "dupes", and all the other unique records are ...Using a BY statement allows us to determine the first and last observation in the "by-group," i.e., all the records with the same value in the variable specified in the BY statement (and often called the "by-variable"). When you use a BY statement in the DATA step, SAS creates two temporary variables that may be used only in that DATA step.I have data set like below... data stansys; infile datalines; input id name&$24. sal; datalines; 101 Richard Rose 5000 102 Yao Chen Hoo 6000 103 Asha Garg Bette Long 7000 104 Jason Blue 9000 105 Susan Robert Stewart 8000 ; run; Through this dataset i want output dataset with seperating as First name and Middle name and last name...If you use a by statement along with a set statement in a data step then SAS creates two automatic variables, FIRST.variable and LAST.variable, where variable is the name of the by variable. FIRST.variable has a value 1 for the first observation in the by group and 0 for all other observations in the by group.The first two functions that actually remove blanks in SAS are the TRIM-function and the TRIMN-function. Both functions remove trailing blanks. However, they differ in how they deal with strings of multiple blanks. If a string consists of only blanks, the TRIM-function returns one blank, while the TRIMN-function returns zero blank characters.Hi, Really annoyed with myself that I can't figure this out (or find the answer online). I have a dataset that covers the last four years (a single month end entry for each account) of accounts moving through arrears cycles and I am trying to identify the first and last occurrence of each account being at each level of arrears cycle so I can calculate how long an account has spent at a ...The last BY group has a value of 929-75-0218 for IdNumber. FINANCE has one observation in this BY group; REPERTORY has three. The Program. ... SAS looks at the first BY group in each data set to determine which BY group should appear first. In this case, the first BY group, observations with the value 029-46-9261 for IdNumber, is the same in ...Example 13.13. The following program tells SAS to process the sales data set by Store and Dept, so we can get a behind-the-scenes look at how we can find the first and last observations of two subgroups: LIBNAME stat481 'C:\yourdrivename\Stat481WC\01sasdata\sasndata'; PROC SORT data = stat481.sales out = srtdsales; by Store Dept;Hey Tapas, I just wanted to share a simplest method to remove the last char of any string, this is amazing and working perfectly for me. data test; input ur_string$; ur_string =scan ( ur_string ,-1); cards; ABC+. aaaaa+.PROC REPORT honors the first of these centering specifications that it finds: the CENTER or NOCENTER option in the PROC REPORT statement or the CENTER toggle in the ROPTIONS window. the CENTER or NOCENTER option stored in the report definition that is loaded with REPORT= in the PROC REPORT statement.Examples: SORT Procedure. Example 1: Sorting by the Values of Multiple Variables. Example 2: Sorting in Descending Order. Example 3: Maintaining the Relative Order of Observations in Each BY Group. Example 4: Retaining the First Observation of Each BY Group.Extract First 5 Characters of String Variable with Varying Lengths. I have a zip code variable in a dataset that includes both 5- and 9-digit zip codes. I want all of them to be 5-digits but am having trouble extracting the first 5 digits of the variable. It is an extensive list, but some examples are 15009, 15208, 191451652, 193760024.Last. structure in SAS to loop over these family members, within a given family while considering the particular month. Can someone help me understand how to do this? I am thinking that I ought to first create a family identification number. Then I will, in my data set, do BY Family_ID and Month. I will then if First.Fam_ID then do, etc.Need to extract first and last name from a provider list. Most records contain a title (MD, OD, PT, CRNP, etc) but not all. The first name on the above list is the most frequent format on the list but there are many other formats - as shown by. records 2-6 above. Using 9.4. Thanks.One reason not to place names in a single field, typical reporting on names often is done on alphabetical by last name then first name. Second names with embedded spaces get hard to distinguish which is first or last programmatically when needed. If you separate them at entry then there is never a question.Listen. 2:27. Spanish beauty and fragrance group Puig Brands SA shares rose after the company and its founding family raised €2.6 billion ($2.8 billion) in an initial public offering, in Europe ...In the DATA step, SAS identifies the beginning and end of each BY group by creating two temporary variables for each BY variable: FIRST. variable and LAST. variable. These temporary variables are available for DATA step programming but are not added to the output data set.You cannot use variables that are created within the DATA step (for example, FIRST. variable, LAST. variable, _N_, or variables that are created in assignment statements) in a WHERE expression because the WHERE statement is executed before the SAS System brings observations into the DATA or PROC step. When WHERE expressions contain comparisons ...I would like to keep the first or last observations for different dategroups: *for each ID in each year-month, keep the FIRST observation if dategroup=BEG; *for each ID in each year-month, keep the LAST observation if dategroup=END; The idea is as following, how to make the code works? appreciated! ...The best thing you did is accurately count the number of elements in your array. I'm going to sketch out valid code for what I think you are trying to do here. data test33; set perso.test; by epci; array sexage {101} sexage000 - sexage100; array sex {101} SEXE1_AGED100000-SEXE1_AGED100100; if first.epci then do i=1 to 101; sexage{i} = 0; end ...The following code is not attempting to solve your logic issue, just to show the values of the first and last created variables so you can follow along and see if your logic matches the values you attempted to use. data selectx; input varname $ countx ; datalines ; AA1 1. AA1 2.The following code is not attempting to solve your logic issue, just to show the values of the first and last created variables so you can follow along and see if your logic matches the values you attempted to use. data selectx; input varname $ countx ; datalines ; AA1 1. AA1 2.Re: substract/divide each row from first row. No need for a multiple TABLE if you just want to assign values to multiple VARIABLES. Below I will show a way you could keep your "matrix" shape, but it looks like you should just restructure your so that instead of multiple variables you have multiple observations.2 The SAS System 15:35 Thursday, September 17, 2015. SYMBOLGEN: Macro variable TODAYMINUS1 resolves to 17. 18 %put todayminus1=&todayminus1; todayminus1= 17. 19. 20 /*If the day of the month is first then we have to use the last month first day and last month last day for date. 20 ! calculations*/ 21 %macro FirstDayOfMonth; 22 %IF (&todayminus1 ...In the DATA step, SAS identifies the beginning and end of each BY group by creating two temporary variables for each BY variable: FIRST. variable and LAST. variable. These …SAS First. and Last. conditional coding. I am trying to use the following 4 columns to create and count new variables, using First. and Last. but I see that First. and Last. are somehow the same for the sorted variables as you can see in the temp variables and so I cannot use them to differentiate a calculation.Splitting an Employee_Name (Last Name, First Name) to (First Name Last Name) Posted 01-25-2019 01:43 PM (7642 views) proc sql; select Manager_Name, Employee_Name, Total_Sales format=COMMA10.2 ... PRX if not avoidable coz some manipulations are done best with PRX, otherwise stick to SAS functions . Disclaimer: …Today: Tuesday, 15 Sep 2020 Next Week: Sunday, 20 Sep 2020 Previous Week: Sunday, 6 Sep 2020. You can also use the SAS INTNX function to calculate the first day, the last, or the same day of the week. To do so we need to use the alignemnt argument. In the example below we set this argument to “b” to calculate the first day of …set ia.usage nobs = nobs firstobs = startobs; drop startobs; run; proc print data = last10; run; If you want both in the same proc print, you can create two views and combine them into another view, then print it: data first10 /view = first10; set ia.usage(obs = 10); run; data first10_last10 /view = first10_last10;Suppose we have the following dataset in SAS that shows the total sales made by two stores during consecutive days: /*create dataset*/ data original_data; input store $ sales; datalines; A 14 A 19 A 22 A 20 A 16 A 26 B 40 B 43 B 29 B 30 B 35 B 33 ; run; /*view dataset*/ proc print data =original_data;choosing the first date and last date in a dataset. Posted 12-12-2011 11:17 AM (3181 views) I am using the code suggested in one of the answers as I want to get the first and last date of a country. data get_first_and_last; set master_table; by ID Date; if first.date or last.Date then output; run; However, I still get the dates in between and I ...May 24, 2019 ... Here we discuss how to use scan and countw to extract first and last name in couple of scenarios.For any queries, please contact us at ...When FIRST.month = 1 SAS has encountered the first observation in the BY group and when LAST.month = 1 SAS has uncounted the last observation. Note this code uses the WORK.PRDSALE_CDN_SOFA data set created at this beginning of this article and also applies the sort procedure to ensure the input dataset is correctly sorted before creating our BY ...In that case, SAS would not set any flags or automatic variables other than _N_, _ERROR_, etc. However, if you WANT to use FIRST.byvar and LAST.byvar processing then you have to "turn them on" with a BY statement inside your DATA step program. So the 2 BY statements in your code are really independent of each other.Launch the SAS program, and edit the LIBNAME statement so that it reflects the location in which you saved the background data set. Then, run the SAS program, and review the output from the PRINT procedure. Compare the output to the output of that from the previous example to convince yourself that the temporary data set back1 indeed contains fourteen observations — observations 7, 8 ...FIRST and LAST variables are created automatically by SAS. FIRST and LAST variables are referenced in the DATA step but they are not part of the output data set. Six temporary variables are created for each BY variable: FIRST.State, LAST.State, FIRST.City, LAST.City, FIRST.ZipCode, and LAST.ZipCode.You can use the following basic syntax to calculate a cumulative sum in SAS: data new_data; set original_data; retain cum_sum; cum_sum+sales; run; . This particular syntax creates a new dataset called new_data that contains a new column called cum_sum that contains the cumulative values of the column called sales.. The following example shows how to use this syntax in practice.
CATT(item1, item2 <, item3, item4, …, item n>). CATS(item1, item2 <, item3, item4, …, item n>). The items 1 to n are the strings you want to concatenate. The CATX function has an extra, obligatory argument, namely a separator argument. With this argument, you can separate the input items in the output string.. Cinemark showtimes orem
When FIRST.month = 1 SAS has encountered the first observation in the BY group and when LAST.month = 1 SAS has uncounted the last observation. Note this code uses the WORK.PRDSALE_CDN_SOFA data set created at this beginning of this article and also applies the sort procedure to ensure the input dataset is correctly sorted before creating our BY ...The next statement tells SAS when to reset the count and to what value to reset the counter. SAS has two built-in keywords that are useful in situations like these: first. and last. (pronounced "first-dot" and "last-dot"). Note that the period is part of the keyword. The variable listed after the first. keyword isSample 49741: Automate writing titles and footnotes to the first and last pages in the RTF document using the macro facility and ODS TEXT statements ODS TEXT statements can be used instead of TITLE and FOOTNOTE statements to place text in the body of an RTF document.With first. or last, you will output a raw tagged as first or last of a series according to the by statement specified (be sure to prior sort a dataset.). The first row in your output dataset is not included in the source dataset. Please, always post your attempt, also if poor. - stat. Jun 1, 2015 at 6:49.first.DATE1 and last.DATE1 mark the beginning and the end of each group for DATE1 inside each group for ID. So to find the start or the end of any (ID, DATE1) group inside the dataset you should look only at FIRST and LAST for DATE1. Now to finding the max value of DATE2.Re: If first. then group by; how to restart count. You have to include the variables in the BY statement if you want SAS to set values for FIRST. and LAST. variables for them. You have to tell SAS not to reset the new variable COUNT to missing when it starts the next iteration.If you use a by statement along with a set statement in a data step then SAS creates two automatic variables, FIRST.variable and LAST.variable, where variable is the name of the by variable. FIRST.variable has a value 1 for the first observation in the by group and 0 for all other observations in the by group.In the following code, the first INPUT statement reads and holds the record in the input buffer. The _INFILE_= option removes the angle brackets (< >) from the numeric data. The second INPUT statement parses the value in the buffer. data _null_; length city number $16. minutes charge 8; infile phonbill firstobs=2;This is a SUM statement . SAS evaluates boolean expressions to 1 (TRUE) or 0 (FALSE). So when FIRST.Y is TRUE it has a value of 1. So when this observation is the first one with this value of Y (within the current value of X) the counter is incremented by 1.How FIRST. and LAST. Variables Works. When an observation is the first in a BY group, SAS sets the value of FIRST. variable to 1 for the variable whose value changed, as well as for all of the variables that follow in the BY statement. For all other observations in the BY group, the value of FIRST. variable is 0.Here is an interesting example that uses the SCAN function to extract the last name from a character variable that contains first and last name as well as a possible middle name or initial. In this example, you want to create a list in alphabetical order by last name. First the program, then the explanation:This example creates a SAS data set and executes the PRINT procedure with FIRSTOBS=2 and OBS=12. The result is 11 observations, that is (12 - 2) + 1 = 11. The result of OBS= in this situation appears to be the observation number that SAS processes last, because the output starts with observation 2, and ends with observation 12.With my limited understanding of Arrays and SAS programing I thought that i could use an arrays variable name to locate data into the array. I cant seem to google anything that explains this very well. In this data step I am trying to use the Usage_type that is equal to the array variable names to change the data from long to wide.Using a subsetting IF statement before testing the FIRST.ID flag could have, in theory, caused a problem as it could have removed the observation where FIRST.ID is true. But since you are removing all of the observations where ID is missing it doesn't really cause any trouble. Your data step is equivalent to these other forms: Solved: Hello ...Pandanggo sa Ilaw, which translates as Dance of Lights, is a waltz-style, playful folk dance that showcases a unique fusion of local and western indigenous dance forms. Originating...I want to output the last value of a variable pr. sub-group to a SAS dataset, preferably in just a few steps. The code below do it, but I was hoping to do it in one step a la by variable; if last.variable then output; as for the case with just 1 by-variable.. data two; input year firm price; cards; 1 1 48 1 1 45 2 2 50 1 2 42 2 1 41 2 2 51 2 1 52 1 1 43 1 2 52; …Select the Last Row by Group. Like the FIRST.variable, there also exists the LAST.variable. As you might expect, you can use the LAST.variable to select the last row of a group in SAS. The LAST.variable takes the value 1 if SAS processes the last row of a group, and 0 otherwise. You use the BY statement in the SAS Data Step to define the …These keywords identify the first and last record in the grouping variable indicated after the BY statement. When an employee ID is unique, the first and last record will be the same row. Thus our code outputs employee ID's where the first and last records are not the same, to a dataset called "dupes", and all the other unique records are ...i want to do following step. 1. see the last day in the different optionid group. if the OTM > 0.1 then output dataA. else output dataB. 2. in dataA and dataB, the hold =absolute value of the delta. 3. , the AAA is the hold -lag (hold) at the first day in the optionid group. in dataA, the AAA is AAA+strike_price. in dataB, the AAA is remained.Using a subsetting IF statement before testing the FIRST.ID flag could have, in theory, caused a problem as it could have removed the observation where FIRST.ID is true. But since you are removing all of the observations where ID is missing it doesn't really cause any trouble. Your data step is equivalent to these other forms: Solved: Hello ....
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