All Questions
Tagged with sas degrees-of-freedom
14
questions
3
votes
0
answers
174
views
Difference in SAS PROC MIXED between DF when using type VC vs FA0(1) for one random effect model
I don't understand why the degrees of freedom (DF) are different between TYPE=VC and ...
- 1,200
1
vote
0
answers
64
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Implementation of Scheffe's adjustment in software
My understanding of Scheffé's adjustment for multiple comparisons is that it already adjusts for any possible contrast that one could make with the data, where the contrast coefficients sum to 0. ...
0
votes
0
answers
70
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What is the equivalence of BETWITHIN degrees of freedom in mixed-effect models R?
As in the title. Let's assume I cannot use the Kenward-Roger or Satterthwaite method in mixed-effect models. I was told to use the BETWITHIN method. Now I switched to R. I can use any package I want. ...
- 195
1
vote
0
answers
130
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Why cannot the sandwich SE be used when the Kenward-Roger denominator df are in use?
This question is about mixed models, and the use of both the Kenward-Roger correction (K-R) for small sample sizes and robust (sandwich) estimators for standard errors in the same model. Is it ...
- 195
4
votes
0
answers
974
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Mixed Anova in R
I am trying to do an anova anaysis in R. The experiment done had each subject tested in Method 1 and Method 2 as well a being in one of 4 different Levels (each subject in one group). The goal is to ...
- 141
4
votes
1
answer
163
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Reduced degrees of freedom using transformed data in one-way ANOVA (SAS PROC MIXED)
On pg. 88 of Design and Analysis of Experiments (8th Ed.) by Montgomery, he's analyzing square root transformed data in a one-way ANOVA. He provides an ANOVA table (SS, d.f., MS, F, p) for these data, ...
- 1,873
6
votes
0
answers
1k
views
Degrees of Freedom using "Containment" method
I have a question about the way SAS uses the "containment" method to obtain degrees of freedom in mixed models. In particular, I think SAS does the wrong thing in obtaining df for least-squares means (...
- 20.8k
12
votes
3
answers
1k
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testing logistic regression coefficients using $t$ and residual deviance degrees of freedom
Summary: Is there any statistical theory to support the use of the $t$-distribution (with degrees of freedom based on the residual deviance) for tests of logistic regression coefficients, rather than ...
- 12.8k
3
votes
2
answers
6k
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SAS and T-Tests - Degrees of Freedom
Why is it that in a normal t-test we have n-2 degrees of freedom while in the SAS output, and consequently the confidence interval constructed from this output, we end up using our 'error' degrees of ...
- 497
3
votes
2
answers
2k
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Which are the correct sum of squares for repeated measures ? (balanced example)
Below are three ways to fit a MANOVA model in R and to extract ANOVA tables from the fitted model. The design is balanced. All methods give different results.
The data are 5 groups of 4 individuals ...
- 19.5k
2
votes
1
answer
11k
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Degrees of freedom in my mixed model
I am having a serious issue trying to figure out why my degrees of freedom are screwy when running my proc mixed model. I have nested data for a MLM analyses, but SAS isn't providing the correct df ...
- 21
5
votes
2
answers
1k
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Weird denominator degrees of freedom in SAS glimmix
I´m trying to learn generalized mixed models in SAS and I have now bumbed into a situation that I cannot figure out by myself. So I was thinking that maybe some of you could help me forward.
I´m ...
- 51
14
votes
1
answer
13k
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Differences between PROC Mixed and lme / lmer in R - degrees of freedom
Note : this question is a repost, as my previous question had to be deleted for legal reasons.
While comparing PROC MIXED from SAS with the function lme from the <...
- 8,952
1
vote
1
answer
2k
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Why proc mixed give different DF than proc glimmix?
I am trying to move data analysis from proc mixed to glimmix for the easy of the ilink transformation. However I am finding a big difference on the denominator DF when using either of them. As ...
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