(a) Start by making a scatter plot. Then plot the predicted values from your regression along with the raw data points, as we did in chapter 2. Does the regression line look like it's fitting the data well? (b) Now run a fourth-order polynomial regression (i.e., include school- ing, schooling, schooling, and schooling. Do those predictions meaningfully differ from the predictions coming from the linear regression? (c) Now run different regressions for some different ranges of schooling. Do those lines look meaningfully different from the predictions you get from a single regression including all the data? (d) Does all this make you think the simple linear approach was reasonable or unreasonable?
(a) Start by making a scatter plot. Then plot the predicted values from your regression along with the raw data points, as we did in chapter 2. Does the regression line look like it's fitting the data well? (b) Now run a fourth-order polynomial regression (i.e., include school- ing, schooling, schooling, and schooling. Do those predictions meaningfully differ from the predictions coming from the linear regression? (c) Now run different regressions for some different ranges of schooling. Do those lines look meaningfully different from the predictions you get from a single regression including all the data? (d) Does all this make you think the simple linear approach was reasonable or unreasonable?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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