Again, consider the 10 stock returns in m-excess-c10sp-9003.txt. The stocks are from companies in 3 industrial sectors. ABT, LLY, MRK, and PFE are major drug companies, \(\mathrm{F}\) and GM are automobile companies, and the rest are big oil companies. Analyze the excess returns using the BARRA industrial factor model. Plot the 3-factor realizations and comment on the adequacy of the fitted model.