Stata 14: type of independent variable in fractional response regression?

[Hang Vu]

Dear Statalist,

I am looking at the instruction paper for factional response regression https://www.stata.com/manuals/rfracreg.pdf and becoming a bit confused about the type of independent variables in this regression:
- In the quick start, it mentions that " Fractional probit model for y with values between 0 and 1 on continuous variable x1"
- In the note of sytax part, it mentions that "indepvars may contain factor variables"
- In the remark part, it mentions that "Fractional regression is a model of the mean of the dependent variable y conditional on covariates x"

As far as I understand, covariates x meaning that indepedent variables should be the continous variable, however, I still concern why indevars may contain factor variables since factor means categorial variables.
Is that possible for me to use categorial variables such as household income, ages, education level as the independent variables for this model?
Hope to get some explaination from you,

Thank you and best regrards,
Hang Vu

[Richard Williams]

You can use the same kinds of independent variables for fracreg as you do for just about everything else. These include continuous variables (e.g. income) and categorical variables (e.g. race).

[Hang Vu]

Richard Williams Thank you so much for your helpful explanation!
Wish you a very nice day!
Best Regards,

Hang Vu