* HINT: * The program assumes that all files are stored in * C:\monographregression\computercode * change directory if code is located elsewhere clear cd C:\monographregression\computercode use "data\stata\golf.dta" * Create orthogonal polynomials of kilometer and of age orthpoly kilometer , generate(kilometerop1 kilometerop2) degree(2) orthpoly age , generate(ageop1 ageop2) degree(2) * Model with polynomials of second degree regress price ageop1 ageop2 kilometerop1 kilometerop2 * Save Cook's distance and leverage predict cook , cooksd predict lev , leverage * List observations with a Cook's distance larger than 0.1 list cook price age kilometer TIA extras1 extras2 if cook > 0.1 * List observations with leverages larger than 2p/n = 0.05813953 sort lev list lev price age kilometer TIA extras1 extras2 if lev > 0.05813953