Created
May 17, 2025 19:12
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examining ICCs for a singular fit
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| ## https://bsky.app/profile/benjiturnbull.bsky.social/post/3lpevi67z4c2w | |
| library(lme4) | |
| dd <- data.frame(f = factor(rep(1:3, each = 10))) | |
| set.seed(105) ## seed-hack to get a singular fit ... | |
| dd$y <- simulate(~1 + (1|f), newdata = dd, | |
| newparams = list(beta = 0, sigma = 1, theta = 0.01))[[1]] | |
| m <- lmer(y ~ 1 + (1|f), data = dd) | |
| performance::icc(m) ## NA | |
| multilevelTools::iccMixed("y", "f", data = dd) ## ICC(f) == 0 | |
| flexplot::icc(m)$icc ## 0 |
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