topic Re: Parameter estimates in New SAS User

Parameter estimates

Xtw — Tue, 26 Oct 2021 20:08:46 GMT

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?

Re: Parameter estimates

Reeza — Tue, 26 Oct 2021 20:15:06 GMT

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.

@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?

Re: Parameter estimates

Xtw — Tue, 26 Oct 2021 20:18:03 GMT

Thank you, the variables itself is has no values

Re: Parameter estimates

Reeza — Tue, 26 Oct 2021 20:30:35 GMT

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.