Question $5 (a) How do you detect an outlier before and after fitting a regression model? (b) What is a measure of influence? (c) Describe the following 3 types of measures of influence: Cook's distance (C). Welsch and Kuh (DFTS), and Hadi's ( H 1 ) . - Lallmwine table shows 3 measures of influence for 20 observations. Identify which nns. and H 4 measures. Why? net. .