topic Re: proc ttest in SAS Procedures

proc ttest

VISHNU239 — Fri, 26 Jan 2018 10:31:03 GMT

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

Re: proc ttest

PeterClemmensen — Fri, 26 Jan 2018 11:39:16 GMT

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

Re: proc ttest

VISHNU239 — Fri, 26 Jan 2018 12:33:20 GMT

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

Re: proc ttest

VISHNU239 — Fri, 26 Jan 2018 12:48:12 GMT

https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_ttest_sect010.htm

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

Re: proc ttest

PaigeMiller — Fri, 26 Jan 2018 12:57:28 GMT

@VISHNU239 wrote:

https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_ttest_sect010.htm

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.

Re: proc ttest

VISHNU239 — Sat, 03 Feb 2018 00:36:02 GMT

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

Re: proc ttest

Reeza — Mon, 11 Jun 2018 01:21:53 GMT

@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.