Compute beta estimates for multi-factor models such as the Fama-French 3 factor model. For that purpose, you extend your regression to ri,t − rf,t = αi +

X k

j=1

βi,k(rj,t − rf,t) + εi,t where rj,t are the k factor returns. Thus, you estimate 4 parameters (αi and the slope coefficients). Provide some summary statistics of the crosssection of firms and their exposure to the different factors.