We consider transformation of the predictor variable with the head-width and femur-length data from previous lectures.
The following data have curvature and an increase in variance as the years of experience increases. Data from A Second Course in Statistics by Mendenhall and Sincich:
experience salary 7 26075 28 79370 23 65726 18 41983 19 62309 15 41154 24 53610 13 33697 2 22444 8 32562 20 43076 21 56000 18 58667 7 22210 2 20521 18 49727 11 33233 21 43628 4 16105 24 65644 20 63022 20 47780 15 38853 25 66537 25 67447 28 64785 26 61581 27 70678 20 51301 18 39346 1 24833 26 65929 20 41721 26 82641 28 99139 23 52624 17 50594 25 53272 26 65343 19 46216 16 54288 3 20844 12 32586 23 71235 20 36530 19 52745 27 67282 25 80931 12 32303 11 38371