topic Re: P value significant but means are not significant in SAS Procedures

P value significant but means are not significant

Olanike — Wed, 18 Oct 2017 16:10:37 GMT

Hi All,

Please I am working on a 2 year data using the Proc mixed procedure. After the analysis (with no error in my SAS log), the P value associated with F value showed a significant difference but my mean values (after Tukey Kramer's adjustement) are not significant.

please how do I explain this.

Please find tattached the result (in excel)

Re: P value significant but means are not significant

PaigeMiller — Wed, 18 Oct 2017 18:10:36 GMT

Do not use MS Office files to share information, they are a security risk, and most people (including me) will not open them. Use PDF or TXT or GIF

The overall p value, associated with the F-test, does not have to agree with Tukey-Kramer. There is a lot of literature on the differences between multiple comparison of means procedures, perhaps you want to read up on this subject.

Re: P value significant but means are not significant

PGStats — Wed, 18 Oct 2017 20:13:45 GMT

The way to put this is something like: "Overall F-test shows significant variation between means, but multiple testing cannot identify significantly different pairs."

Re: P value significant but means are not significant

Olanike — Wed, 18 Oct 2017 20:33:53 GMT

Noted paige miller

Re: P value significant but means are not significant

Olanike — Wed, 18 Oct 2017 20:37:43 GMT

Much appreciated PG. I will report it as you have advised.