Timeline for Two negative beta's in a curvilinear regression when mean centered or using standardized values
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 23, 2012 at 23:56 | comment | added | Peter Flom | That is weird, and reveals that people don't know elementary algebra. | |
| Sep 23, 2012 at 23:53 | comment | added | user14322 | @Peter Thank you very much for your answer. The confusing point was that in every academic article that I read they elaborated that there was an inverted U-shaped relation, because the normal predictor was positive and significant and the squared term was negative and significant. | |
| Sep 23, 2012 at 22:38 | comment | added | rolando2 | When I ran @Peter's code several times I sometimes got a pos. coeff. for centx and sometimes a neg. The fact that y ranged from about -25 to 5, whereas x was always pos., seems to help explain why the centx coeff. was sometimes neg. | |
| Sep 23, 2012 at 21:35 | history | answered | Peter Flom | CC BY-SA 3.0 |