Timeline for Why does Logistic regression doesn't give the same result as a Chi square test when testing difference of frequency with more than 2 groups?
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| Apr 7, 2022 at 14:25 | history | edited | kjetil b halvorsen♦ | CC BY-SA 4.0 |
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| Sep 27, 2018 at 10:42 | history | edited | kjetil b halvorsen♦ |
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| Sep 23, 2018 at 19:04 | vote | accept | ecjb | ||
| Sep 23, 2018 at 15:51 | comment | added | ecjb |
Dear @mdewey. Thank you very much for your answer. Provided the simulated data, do you have an idea of the code which should be run to perform a logistic regression using glmnet?
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| Sep 23, 2018 at 15:22 | answer | added | Sal Mangiafico | timeline score: 2 | |
| Sep 23, 2018 at 14:52 | comment | added | mdewey | If your outcome variable is genuinely always 1 as you suggest in your introduction then you have separation in your mixed model which probably accounts for (a) the huge estimates on the log scale, (b) the huge standard errors, (c) the failure of the model to converge. See stats.stackexchange.com/questions/11109/… for some more information. | |
| Sep 23, 2018 at 14:18 | history | edited | ecjb | CC BY-SA 4.0 |
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| Sep 23, 2018 at 14:11 | comment | added | ecjb |
Thank you for your comment @SalMangiafico. I added your seed and adapted the ouput. Any idea why there is a difference between output of post hoc chi square and logistic regression?
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| Sep 23, 2018 at 14:06 | history | edited | ecjb | CC BY-SA 4.0 |
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| Sep 23, 2018 at 13:39 | comment | added | Sal Mangiafico |
As you say in your question, the mixed model is the preferable one. When I run your code, I get very different answers for each run. Maybe you want to start your sample code with e.g. set.seed(12345), so that everyone gets the same results?
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| Sep 23, 2018 at 13:28 | comment | added | mdewey | The best model is the mixed one. | |
| Sep 23, 2018 at 10:59 | history | edited | ecjb | CC BY-SA 4.0 |
removed the serial chi square tests by one single post-hoc t-test
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| S Sep 23, 2018 at 9:14 | history | suggested | Patty | CC BY-SA 4.0 |
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| Sep 23, 2018 at 9:05 | review | Suggested edits | |||
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| Sep 23, 2018 at 7:30 | history | edited | ecjb | CC BY-SA 4.0 |
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| Sep 23, 2018 at 6:56 | history | migrated | from stackoverflow.com (revisions) | ||
| Sep 22, 2018 at 22:40 | history | asked | ecjb | CC BY-SA 4.0 |