Parameter estimates

[Xtw]

Hi, may someone please tell me why some categorical variables have only zeros for estimates and zeroes p-values under the parameter estimate output? Is it because they are not significant and should not be included in the model?

[Reeza]

Some levels of categorical variables? Or the variable itself? Those are two different issues. 

If it's just a level per categorical variable, it's usually because that's the reference level. When you dummy code a variable that has 3 levels, you need 2 dummy variables only. The third gets rolled into the intercept. This is because you only need two data points to figure out what the third would be. 

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@Xtw wrote:
Hi, may someone please tell me why some categorical variables have only zeros for estimates and zeroes p-values under the parameter estimate output? Is it because they are not significant and should not be included in the model?

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[Xtw]

Thank you, the variables itself is has no values

[Reeza]

Is it a binary variable? What does the log show? The more information your provide the faster and easier it is to provide an answer.