what is Diff(1-2) in proc ttest procedure?
They are simple statistics for the two populations being compared.
For an example and explanation, see PROC TTEST: Comparing Group Means
They are listed in Figure 92.5 and explained above
how the values are calculated for the diff(1-2) for pooled and satterthwhaite in the attachment listed below.
in the above link when the observations are only 30 in the output table N=44 .why?
@VISHNU239 wrote:
in the above link when the observations are only 30 in the output table N=44 .why?
This is clearly explained in the text at that link.
@VISHNU239 wrote:
that is what i didnt understood. what has it to do with the count included in the freq?
Count tells SAS how to weight the observations. If you have three identical responses for example, rather than have three entries, you can have the count=3 instead.
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