Timeline for Determine statistical difference of slopes of quadratic relationship in a Poisson regression
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
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| Feb 13 at 17:05 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Oct 14, 2023 at 10:05 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Jun 13, 2023 at 12:03 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Jan 16, 2023 at 10:02 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| S Dec 4, 2019 at 12:02 | history | bounty ended | CommunityBot | ||
| S Dec 4, 2019 at 12:02 | history | notice removed | CommunityBot | ||
| Dec 1, 2019 at 18:00 | history | tweeted | twitter.com/StackStats/status/1201199433574207490 | ||
| Nov 27, 2019 at 21:43 | answer | added | Guilherme Marthe | timeline score: 1 | |
| Nov 26, 2019 at 10:59 | comment | added | Knarpie | How about taking the derivative of Y wrt X for your model, at the different points, and test whether their difference is zero? The standard error of this test statistic can be approximated through delta method. Check this approximation in a simulation study though | |
| S Nov 26, 2019 at 10:37 | history | bounty started | SJDS | ||
| S Nov 26, 2019 at 10:37 | history | notice added | SJDS | Draw attention | |
| Nov 21, 2019 at 9:19 | comment | added | SJDS | Hi @Knarpie, this is not entirely what I want. I know from the regressions that the interactions matter and that the original concave relationship between X and Y becomes steeper as Z increases. What I need to test is whether there is a statistical difference between the steepening (i.e. narrowing of the concave relationship) in the two samples. e.g. X is between 0 and 1 and the concave relationship reaches its turning point at about 0.4 (in both samples). I'm calculating the slopes of the curve at values X = 0.15, 0.2, 0.35 for Z = mean and Z = mean + 1SD. How to compare the slopes? | |
| Nov 21, 2019 at 8:30 | comment | added | Knarpie | If I understand correctly you want to see if the shape of y in function of x depends on z? Than how about a joint test H0: b3=b4=0? | |
| Nov 21, 2019 at 7:20 | history | asked | SJDS | CC BY-SA 4.0 |