proc ttest

[VISHNU239]

what is Diff(1-2) in proc ttest procedure?

[PeterClemmensen]

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

[VISHNU239]

how the values are calculated for the diff(1-2) for pooled and satterthwhaite in the attachment listed below.

[VISHNU239]

https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_ttest_sect0...

in the above link when the observations are only 30 in the output table N=44 .why?

[PaigeMiller]

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@VISHNU239 wrote:

https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_ttest_sect0...

in the above link when the observations are only 30 in the output table N=44 .why?

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This is clearly explained in the text at that link.

[VISHNU239]

that is what i didnt understood. what has it to do with the count included in the freq?

[Reeza]

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@VISHNU239 wrote:
that is what i didnt understood. what has it to do with the count included in the freq?

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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.