What Are Fixed Regressors?

What does a fixed regressor actually mean? It means that we are to think of xi not as an outcome of a random process but merely as a fixed set of numbers.

What does fixed effects control for?

By including fixed effects (group dummies), you are controlling for the average differences across cities in any observable or unobservable predictors, such as differences in quality, sophistication, etc. The fixed effect coefficients soak up all the across-group action.

What are fixed effects in statistics?

In statistics, a fixed effects model is a statistical model in which the model parameters are fixed or non-random quantities. ... In panel data where longitudinal observations exist for the same subject, fixed effects represent the subject-specific means.