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    how to compare poisson regression coefficients between two models in SPSS?

    I have two different Poisson models: Y = b1 + b2*X (1) Y = b1 + b3*X + b4*C (2) I would like to compare whether b2 is different than b3? The model is a poisson regression, is there a quick way to do it in SPSS? Many thanks Ezgi