topic Recover in a dataset the 95%CI for means differences (Diff(1-2)) in case of unequal variances in New SAS User

Recover in a dataset the 95%CI for means differences (Diff(1-2)) in case of unequal variances

AudStat — Thu, 18 Apr 2019 10:01:12 GMT

hi,

I need to recover in a DataSet the 95%CI for means differences (Diff(1-2)) in case of unequal variances using Proc ttest. But the ods output give me only the 95%CI for means differences in case of equal variances

Have you an idea about how to get the 95%CI of Diff(1-2) when method=Satterthwaite in a dataset?

See the example below : I would like to get the result circled in green

Thank you in advance for your answer

Best regards

ods output Statistics=Ds_stat ;

PROC TTEST data=myDS ;

CLASS sex ;

VAR CHIR_ASAT ;

RUN;

Re: Recover in a dataset the 95%CI for means differences (Diff(1-2)) in case of unequal variances

PaigeMiller — Thu, 18 Apr 2019 10:39:51 GMT

Your code seems correct, the data set DS_STAT should have this information. But it does not appear to have the information. Can you try running this again and show us the output data set?

Re: Recover in a dataset the 95%CI for means differences (Diff(1-2)) in case of unequal variances

AudStat — Thu, 18 Apr 2019 11:46:12 GMT

Thank you Paige for your attention.

I join you the output dataset

Re: Recover in a dataset the 95%CI for means differences (Diff(1-2)) in case of unequal variances

PaigeMiller — Thu, 18 Apr 2019 11:57:34 GMT

Seems like a bug in SAS, and you probably ought to contact SAS Technical Support.

I did not experience this problem (on a different data set).

Re: Recover in a dataset the 95%CI for means differences (Diff(1-2)) in case of unequal variances

ballardw — Thu, 18 Apr 2019 14:49:42 GMT

Wrong table:

ods output conflimits=

EACH table has a name and you need to explicitly name the correct one to get the output you want.

The documentation will have the list of table names and required options, or you can use

ODS TRACE on;

ods trace off;

to get a list of the tables generated by your code.

Re: Recover in a dataset the 95%CI for means differences (Diff(1-2)) in case of unequal variances

AudStat — Thu, 18 Apr 2019 14:49:59 GMT

Thank you very much !