Timeline for What is the error covariance structure for linear mixed effects models estimated by lme4?
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 5, 2023 at 9:40 | vote | accept | Harmony | ||
| Dec 4, 2023 at 0:54 | history | edited | statmerkur | CC BY-SA 4.0 | deleted 75 characters in body; edited title |
| Dec 3, 2023 at 19:22 | answer | added | Dimitris Rizopoulos | timeline score: 7 | |
| Dec 3, 2023 at 18:49 | comment | added | PBulls | I've seen conflicting information but always assumed lme4 did unstructured only. This page shows how you can trick it into fitting certain structured covariances - never tried though & looks complicated. | |
| Dec 3, 2023 at 16:53 | comment | added | Harmony | @PeterFlom I have also read that by fitting random slopes for the time variable, this results in something similar to an AR1 structure. I have probably got that wrong (AR1 that is), I'm not entirely sure what exactly it does do (that was going to be the subject of a further question. I just didn't want to ask too much in one go!) | |
| Dec 3, 2023 at 13:21 | comment | added | Peter Flom | @statmerkur That makes sense and is good to know. I've retired, but when I was working, I mostly used SAS. These days, I don't have access to it (it's expensive) and my R knowledge is somewhat lacking. | |
| Dec 3, 2023 at 13:09 | comment | added | statmerkur | @PeterFlom This is a limitation of the lme4 package, not of $\textsf{R}$. Other package, such as nlme, implement R-side effects or covariance structures. | |
| Dec 3, 2023 at 11:36 | comment | added | Peter Flom | This seems like a major disadvantage of R compared to SAS, which offers a large variety of choices. But I wonder if there is a work around. | |
| Dec 3, 2023 at 11:14 | answer | added | statmerkur | timeline score: 5 | |
| Dec 3, 2023 at 10:42 | history | edited | Harmony | tags added | |
| S Dec 2, 2023 at 21:01 | review | First questions | |||
| Dec 2, 2023 at 22:15 | |||||
| S Dec 2, 2023 at 21:01 | history | asked | Harmony | CC BY-SA 4.0 |