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10-29-2014 04:43 PM

I have a small dataset ( ~2000 obs) and ~20 vars of which the var X is really crucial. Var x has values ( a and b ) such that a:b =6:4. I want to create two samples ( 1800 Obs and 200 obs) of this dataset such that in final datasets it keeps the ratio of a :b in var x same (6:4). How shall i do that.

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Solution

10-30-2014
09:33 AM

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10-30-2014 09:33 AM

Separate the original dataset into two, one for x=a and the other for x=b.

From x=a data set sample 1080 (60% of 1800) and 120 (60% of 200). Do analogously for x=b data set.

Join the two subset to get the final file of 1800. Ditto for 200.

When I do a sample without replacement, I will often add a variable to the data generated with ranuni (or one of the other random number generators in SAS), sort on that variable and then just do a DATA step to sequentially pull the samples. You should also be able to do this with PROC SURVEYSELECT, but I like the simplicity in interpretation of the DATA step.

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10-30-2014 04:55 AM

Can you please give some example of output datasets?

Solution

10-30-2014
09:33 AM

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10-30-2014 09:33 AM

Separate the original dataset into two, one for x=a and the other for x=b.

From x=a data set sample 1080 (60% of 1800) and 120 (60% of 200). Do analogously for x=b data set.

Join the two subset to get the final file of 1800. Ditto for 200.

When I do a sample without replacement, I will often add a variable to the data generated with ranuni (or one of the other random number generators in SAS), sort on that variable and then just do a DATA step to sequentially pull the samples. You should also be able to do this with PROC SURVEYSELECT, but I like the simplicity in interpretation of the DATA step.

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10-30-2014 10:18 AM

For more details on Doc's advice, see the article Sample without replacement in SAS - The DO Loop

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10-30-2014 02:38 PM

Thanks a lot Doc@Duke and Rick. It is really helpful.