Timeline for how to specify a hierarchical mixed model with two factors nested within participant that are crossed with each other
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Sep 18, 2021 at 12:20 | vote | accept | Katie | ||
| Sep 18, 2021 at 8:30 | answer | added | Robert Long | timeline score: 2 | |
| Sep 18, 2021 at 8:16 | comment | added | Robert Long | The 2nd model is singular. As for the denomnator degress of freedom, in a mixed model this is an approximation at best and woefully wrong at worst and underlines why I recommend not using p-values at all - they are little more than a test of sample size. | |
| Sep 17, 2021 at 21:36 | history | edited | Katie | CC BY-SA 4.0 |
added 2 characters in body
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| Sep 17, 2021 at 21:27 | comment | added | Katie | Specifically, I think my mistake may be about the degrees of freedom in my denominator, but I can't figure out how to correctly specify them. A domain expert also pointed me to this blogpost, which may be affecting my inference as well: mumfordbrainstats.tumblr.com/post/126904300281/… | |
| Sep 17, 2021 at 21:24 | comment | added | Katie | @RobertLong thanks for the engagement! I added both outputs. As for the p-values, if asked to weigh the likelihood that an interaction in my experimental variables (e.g. typeN:taughtU ) is determining a contrast in brain activation estimable with such precision, versus the likelihood that I'm making a mistake in reasoning somewhere, I think "I'm making a mistake" is more plausible. | |
| Sep 17, 2021 at 21:19 | history | edited | Katie | CC BY-SA 4.0 |
added output of summary function for both models
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| Sep 17, 2021 at 20:41 | comment | added | Robert Long |
Please include the output of summary(model) for both models. Also please can you let us know how you determine whether a p-value is plausible ?
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| Sep 17, 2021 at 16:46 | history | edited | Katie | CC BY-SA 4.0 |
updated the question regarding singular fit warning
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| S Sep 17, 2021 at 13:30 | review | First questions | |||
| Sep 17, 2021 at 14:06 | |||||
| S Sep 17, 2021 at 13:30 | history | asked | Katie | CC BY-SA 4.0 |