Repeat Exercise 4, only use the data in the file B3 dat.txt. Comment on the results.
A portion of the data from the Well Elderly 2 study is stored in the authorĂ˘â‚¬â„˘s web page in the file A3 dat.txt. These are measures taken after intervention. Use the R function qhdsm to create a smooth for the 0.2, 0.5, and 0.8 quantiles using the data with the label MAPAGLOB as the independent variable (a measure of meaningful activities) and the data with the label LSIZ (life satisfaction) as the dependent variable. What does the smooth suggest about using the R function khomreg in Section 6.8.1 to test the hypothesis of homoscedasticity with leverage points removed?
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