Help using Base SAS procedures

ttest proc with weight option

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ttest proc with weight option

Hello everyone,

I tried to use the ttest procedure while using the WEIGHT option. In the output I got, there was only t-test for the 'equal variances' case.

When I tried to use the COCHRAN option to get the t-test for unequal variances I got a warning message: 'WARNING: The COCHRAN option is ignored when using WEIGHT statement'.

I should note that when I don't weight the cases I receive all of the relevant t-test: t-test for equal variances (pooled), t-test for unequal variances (Satterthwaite) and t-test for unequal variances (Cochran).

Is anyone familiar with this problem?

How can I weight my cases but still get the unequal variances t-test in the output (as some of the Levin tests indicate that I should reject the equal variances null assumption).

Thanks!

Super User
Posts: 9,682

Re: ttest proc with weight option

Did you try to use FREQ statement?

I think the best way is to talk with Technical Support .

From your log , It seems that you can get the t-test for unequal variances.

Ksharp

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