I am trying to fit a model by using ordinal regression. I have got two co-variates, and one factor with four groups. The dependent variable has 28 points (1.00, 1.25, 1.50... 7).

I use SPSS.

My research model fits nicely and the sig. of the Parameter Estimates of the IVs are quite good.

But; The Sig. of the Test of Parallel Lines is .000.

The Link Function I use is Complementary log-log. When I switch the Link Function to Probit and Negative log-log, my Test of Parallel Lines is fine, but the model don't fit any more.

I have tried regrouping the factors and redusing the number of desimals in the DV to the nearest half (1.00, 1.50, 2.00 ...7). Is there something else I can do, and how can I approach this a little more systematic?

Lotte (I'll be only to happy to send all test data if wanted)