I would like to drop some factor variable coefficients in my regressions, since they are mere controls. I checked the manual ("drop(list) drop individual coefficients") but could'nt find how to handle factors here.

Code:
* OLS regression without factor variable
sysuse auto, clear
regress price weight mpg rep78 foreign
esttab, drop(rep78) // this drop is fine

* OLS regression with factor variable
sysuse auto, clear
regress price weight mpg i.rep78 foreign
esttab, drop(rep78) // not working, how to drop factor coefficients in regression table?
esttab, drop(i.rep78) // not working
esttab, drop(`rep78') // not working
Thank you.