cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
The Discovery Summit 2025 Call for Content is open! Submit an abstract today to present at our premier analytics conference.
See how to use JMP Live to centralize and share reports within groups. Webinar with Q&A April 4, 2pm ET.
Choose Language Hide Translation Bar
View Original Published Thread

Degrees of freedom discrepency

rcspencer
Level II

I am running a mixed model effect on two different dependent variables.  Both variables cosist of continuous, real numbers with no missing data.  However, I get two different degrees of freedom depending on which dependent variable I use in my analysis.  Since they both contain the same number of responses, I don't understand how this is happening.  Any insight?  IIt also looks like there are only 5 responses shown plotted for the dependent variable Prop, while d' displays all 6 data points.  Attached is a subsset of my data which displays the same errors.  

 



1 ACCEPTED SOLUTION

Accepted Solutions


Re: Degrees of freedom discrepency

Select Help > Books > Fitting Linear Models. Search on REML to see background information about the estimation merthod and the reports. Search on Kackar-Harville to see details about this adjustment.

View solution in original post

4 REPLIES 4
rcspencer
Level II


Re: Degrees of freedom discrepency

I should specify that it is actually the DFDen that is changing.


Re: Degrees of freedom discrepency

I assume that you are using the default REML procedure and its default options to fit this model. As such, the degrees of freedom for the denominator are adjusted and the adjustment depends on the response variable and parameter estimates.


Re: Degrees of freedom discrepency

Select Help > Books > Fitting Linear Models. Search on REML to see background information about the estimation merthod and the reports. Search on Kackar-Harville to see details about this adjustment.

rcspencer
Level II


Re: Degrees of freedom discrepency

Thanks so much!