. Suppose you are performing a cross-firm analysis of profits during the pandemic. You suspect that the population model which determines a firm's profits (P) includes sales (S), the number of competitors as measured by the industry concentration ratio HHI index (H) and the average wage in the region where the firm operates (W). You believe that the population model is linear: P = Bo + B1S + B2H + B3W + u Write out formula to estimate B2 after first partialing out the other regressors. Include an explanations of the steps. . Suppose you are performing a cross-firm analysis of profits during the pandemic. You suspect that the population model which determines a firm's profits (P) includes sales (S), the number of competitors as measured by the industry concentration ratio HHI index (H) and the average wage in the region where the firm operates (W). You believe that the population model is linear: P = Bo + B1S + B2H + B3W + u Write out formula to estimate B2 after first partialing out the other regressors. Include an explanations of the steps