Tagged Questions
2
votes
1answer
73 views
How is the Df computed in a mixed model?
The following is the output for a mixed model example. The only difference between fm1 and fm2 is the random factor "URBAN", why the df for fm2 is 5 but not 4? Any help would be great.
...
1
vote
1answer
412 views
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 ...
5
votes
2answers
282 views
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 ...
2
votes
1answer
1k views
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 ...
1
vote
0answers
201 views
Interpreting group level coefficents/degrees of freedom in mixed effects model
I was hoping you could provide some information on how one should interpret and present group level coefficients and degrees of freedom in a mixed effects (in my case: logistic) model. I'm fully ...
13
votes
2answers
2k views
How should mixed effects models be compared and or validated?
How are (linear) mixed effects models normally compared against each other? I know likelihood ratio tests can be used, but this doesn't work if one model is not a 'subset' of the other correct?
Is ...
1
vote
1answer
529 views
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 ...
5
votes
1answer
2k views
Why are degrees of freedom so high in repeated measures mixed models?
I have been running a repeated measures mixed model in SAS and the denominator degrees of freedom for the F statistic seems to be really high. In this case I have roughly 200 individuals and three ...
