Posts
SAS Tip_less code: Assigning 1 or 0 to flag variable
*Creating a flag variable when a test variable meets certain criteria is very common for SAS programmer….
Many SAS programmers use the below code to assign a flag of 1 or 0 depending on of the test variable meets criteria or not.;
*Ex:;
*Create a test dataset;
data test;
input id age sex $;
cards ;
1 25 Male
2 35 Female
3 29 Female
4 37 Male
5 32 Male
;
run ;
*Most programmers use the following code to assign avalue of 1 0r 0 to flag variable;
data test1;
set test;
if sex= 'Male' then flag=1;
else flag=0;
run ;
*Some programmers use the following code to do the same task;
data test;
set test;
flag= ifn (sex= 'Male' ,1,0);
run ;
*You can write ....even simpler code than the above 2 dataset step methods.;
data test2;
set test;
flag= 'Male' =sex;
run ;
*Or;
data test3;
set test;
flag=sex= 'Male' ;
run ;
* Note : The above code does the same thing as the 1st and 2nd method;
Cave...
Dummy Dataset or SAS Options: Which is better to insert a Zero Row?
Always, programmers need to summarize the demographics data and show it in a table and to do so they use Proc Freq procedure. Even though proc Freq calculates the Frequency exactly, it may not be the write procedure in all cases especially when data do not exist. Some times statistician wants to see all the data values on the CRF in the final table, even though there is no combination as such exists in the dataset. In this case we have to insert observations with 0 values. Here I will present you ….the different methods to insert a zero row. 1) Creating a Dummy Dataset and Concatenate the dummy dataset with the input dataset. 2) Proc Freq SPARSE option 3) Proc Means COMPLETETYPES Option 4) Proc Means COMPLETETYPES O ption with PRELOADFMT option. Dummy Dataset: Adv: Simple and doesn’t need any formats Caveat : Programmer has to know all the possible combinations Sparse Option: Lists all possible combinations of variable levels even when a combination does not occur. Syntax: p...
A Sampler of What’s New in Base SAS 9.2
Direct Link: . philasug.org/Presentations/200811/SAS92.ppt Direct Link: http://www.sas.com/offices/NA/canada/downloads/presentations/Calgary2008/SAS9.2.pdf Direct Link: http://rtsug.org/ppt/Secosky_nov07.ppt philasug.org/Presentations/200811/SAS92.ppt" style="height: 45em;" width="100%"> http://rtsug.org/ppt/Secosky_nov07.ppt" style="height: 45em;" width="100%">
