Hello; I have a panel data set, some of the variables change over time, while some others don't. For example, dependent variable is the number of publications by professors in each year which changes over time. independent variable is the amount of research grants that a professor has per year, which also changes over time. the other independent variable is the type university with which the professor is affiliated with (teaching vs research school), which does not change in my data set. When I run a panel regression with fixed effect, I do not get any estimates for the university type, the university type effects are only only estimated in the random effects model. However, I know that in addition to the university type, there are some characteristics that pertain to professors and do not change over time which I have not been able to measure and thus theoretically I need to run a fixed effects model. Is there any way to keep the university type as a variable which does not change over time and still run a fixed effects model? Thanks
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