Interpretation of parameters in loglinear models

Posted by Abigail on Jun 01, 2011; 3:08pm
URL: http://spssx-discussion.165.s1.nabble.com/Interpretation-of-parameters-in-loglinear-models-tp4445521.html

Hello,

I am trouble using the parameter estimates table to interpret the effects in my loglinear model-paremeter.estimates.xls

Previously I have done crosstabs to examine 2-way terms in my models but now I have one variable which is a continous covariate (forearm) so now I am looking at the parameter estimates to interpret the terms that include my covariate: posture*forearm and diam*no.of.sup*forearm.

I know that SPSS takes the last category in the variable as a baseline and therefore does not provide parameter estimates for them. Within my variables there are no clear base-line categories, I really need to get values for all of the category combinations in order to fully interpret the terms in the model but I do not know how to work these out. For the 3-way relationship it is even more difficult because it only provides parameter estimates for 1 of the 4 combinations.

Does anyone know how to work out the values that have been set to zero? Or is there a better way to interpret interaction terms that involve a covariate?

Thanks,

Abigail