Dear All,
I am having a few problems with running some GEE tests using SPSS16.
The data I am modelling consists of measures of car ownership for a number
of respondents over two time periods along with a list of socio-economic and
other explanatory variables. The response (car ownership) is modelled as an
ordinal response.
Firstly, it is not possible to generate a measure of the overall fit of the
model such as a pseudo r-squared value. Does anyone know why this might be
or if there is a good reason why this is not available?
Secondly, when modelling the response as four categories, the model runs
perfectly well. When re-running the exact same model for three categories
(a simpler model), SPSS states that the model can't be run due to
computational errors? Any suggestions? Maybe I should just try some
different software?
Any help would be much appreciated.
Lee Woods
University of Strathclyde, Glasgow, Scotland.
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