Q7 Comparing Mean LDL Levels by BMI by Statin Usage (4 Points + 6 Extra Credit Points) How do mean LDL cholesterol levels vary by BMI and statins useage while controlling for age and glucose levels? Running separate regression models for statins users (statins==1) and and non-users(statins==0) one finds different relationships between LDL and BMI. # # # # Call: ## Im(formula = LDL ~ BMI + glucose + age, data = hers, subset = statins == # # # # ## Residuals: ## Min 1Q Median 3Q Max ## -80.067 -23.563 -3.535 18.185 176.563 ## ## Coefficients: # # Estimate Std. Error t value Pr(> It!) ## (Intercept) 147.20614 23.34593 6.305 8.47e-10 *** ## BMI 0.02981 0.35977 0.083 0.934 ## glucose 0.08936 0.05757 -1.552 0.122 ## age 0.07099 0.29084 -0.244 0.807 # # --- ## Signit codes: 0 '*** 0.001 "** 0.01 '* 0.05 '.' 0.1 ' ' 1 # # ## Residual standard error: 34.21 on 358 degrees of freedom ## (3 observations deleted due to missingness) ## Multiple R-squared: 0.006987, Adjusted R-squared: -0.001334 ## F-statistic: 0.8397 on 3 and 358 DF, p-value: 0.4728 # # # # Call: ## Im(formula = LDL ~ BMI + glucose + age, data = hers, subset = statins == # # # # ## Residuals: # # Min 10 Median 30 Max ## -105.478 -23.959 -2.021 22.169 239.807 # # # # Coefficients: # # Estimate Std. Error t value Pr(>It!) ## (Intercept) 166.37538 17.16624 9.692