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Logistic Regression ModelingI'm attempting to do some logistic regression modeling on a huge dataset consisting of customer behavior (Good/Bad) and demographic predictors (income, gender, etc.). I have almost 45K records but there is a lot of missing data (only about 23K complete records).

I would like to use the Validate feature in Fit Model but can't seem to get it to work. I have a column that contains only 3 unique values ("Training", "Validation", "Test") which I enter as the Validation column but it seems that it just continues to fit all the data.

I was also wondering why I always get significant lack of fit in my models. Is this simply a matter of the huge sample size?

Thanks for any insight!Re: Logistic Regression ModelingWhat platform are you using to do Logistic regression and do you have JMP Pro, JMP 9 or JMP 8?Re: Logistic Regression Modelingmewing,

Thanks for the response! I'm using JMP 9 and am using the Fit Model platform. I've tried several different models (main effects only and main effects plus two-factor interactions for different subsets of the predictors) and the lack of fit is always significant.