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Model comparison: All models fitted by maximum likelihood.
| Model | ICC | AIC | BIC | LR test vs previous |
|---|---|---|---|---|
| Null (random intercept) | 0.178 | 744,259 | 744,288 | — |
| Model 1 (+ covariates) | 0.177 | 729,621 | 729,735 | χ2 = 14,656.80, df = 9*** |
| Model 2 (+ year) | 0.151 | 729,193 | 729,347 | χ2 = 435.04, df = 4*** |
| Model 3 (+ random slope) | — | 728,734 | 728,907 | χ2 = 463.07, df = 2*** |
***p < 0.001.
