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bc
Calcite | Level 5 bc
Calcite | Level 5
I have computed the change from baselines for subjects in each of 2 groups. I would like to compute the median difference (and confidence interval) between the 2 groups for this change score. What procedure will do this?

Thanks.
4 REPLIES 4
Doc_Duke
Rhodochrosite | Level 12
You can get the median from PROCs MEANS, SUMMARY, or UNIVARIATE, among others. The usual confidence interval for a median is the 25th and 75th percentile.

Search for "Keywords and Formulas" on support.sas.com to get the 9.2 descriptions of where you can get what basic statistics.
mfisher
Fluorite | Level 6
This paper describes what you need:

http://www.lexjansen.com/pharmasug/2000/Coders/cc01.pdf
SteveDenham
Jade | Level 19
The Hodges Lehmann estimate is available in SAS 9.2 in PROC NPAR1WAY, including exact confidence intervals.

Steve Denham
bc
Calcite | Level 5 bc
Calcite | Level 5
> This paper describes what you need:
>
> http://www.lexjansen.com/pharmasug/2000/Coders/cc01.pd

Thank you - this is exactly what I was looking for (since I'm still using version 9.1).
-Bruce

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