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Posted 10-18-2018 12:54 PM
(2187 views)

Hello,

I want to report degrees of freedom for the F value from the output of PROC MIXED and PROC GLIMMIX. What should I report since the output only includes degrees of freedom for numerators and denominators?

Thanks in advance for your help,

D

10 REPLIES 10

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@ANKH1 wrote:

Hello,

I want to report degrees of freedom for the F value from the output of PROC MIXED and PROC GLIMMIX. What should I report since the output only includes degrees of freedom for numerators and denominators?

I believe this represents a mis-understanding on your part.

There is no such thing as a single "degrees of freedom for the F value". All F-values have both numerator and denominator degrees of freedom.

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Paige Miller

Paige Miller

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There is no such thing as a single "degrees of freedom for the F value". All F-values have both numerator and denominator degrees of freedom.

You report both the numerator and denominator degrees of freedom

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Paige Miller

Paige Miller

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Hello,

I have been told that when you report the F value you have to include df. This is an example from SPSS:

For example you report the main effect of SRA as F(2, 1276) = 6.11, p = .002, ηp2 = .009.

SAS output only gives df for numerator and denominator. The first df is referring to the levels of the variable but the second is referring to the df of the error and the SAS output I get doesn't provide it. Do you know how can I get it?

Thanks!

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I guess I don't understand the relevance of an SPSS output to PROC MIXED.

Did you actually produce the output from PROC MIXED? This is an example PROC MIXED output which clearly produces numerator and denominator degrees of freedom: https://documentation.sas.com/?docsetId=statug&docsetTarget=statug_mixed_examples01.htm&docsetVersio...

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Paige Miller

Paige Miller

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I guess we're not communicating. That example shows both numerator and denominator DF for the F-test. I don't understand why you say it doesn't.

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Paige Miller

Paige Miller

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DF for error is the same (different words, that's all) as DF for denominator

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Paige Miller

Paige Miller

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Oh, I did not know that. Thanks for the clarification and your help!

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