sorry, I know it hard to read.
Here I repeated it again the data set
Below is the example data, there will be 4 groups with the same values of variables B and C.
For example: id 001 (50 20), id 005 (50 20), id 007 (50 20) categories as the same group, because they have the same values of B and C, and so on ...
I want to do random sampling for 2 samples from each group.
so in this example data, I will get 8 samples from 15 observations.
My actual data set have thousands of observations.
I wonder if there are codes to run the sampling at once by group.
Thank you in advance.
data have; input ID $ B C; datalines; 001 50 20 002 50 30 003 40 20 004 70 30 005 50 20 006 40 20 007 50 20 008 40 20 009 50 30 010 70 30 011 40 20 012 70 30 013 40 20 014 50 30 015 70 30 ; run;
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