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VISHNU239
Obsidian | Level 7

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

6 REPLIES 6
PeterClemmensen
Tourmaline | Level 20

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
Obsidian | Level 7

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

VISHNU239
Obsidian | Level 7

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
Diamond | Level 26

@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?


This is clearly explained in the text at that link.

--
Paige Miller
VISHNU239
Obsidian | Level 7
that is what i didnt understood. what has it to do with the count included in the freq?
Reeza
Super User

@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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