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extractAIC() vs AIC()
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| fit_test = lm(dist ~ ., data = cars) | |
| n = length(resid(fit_test)) | |
| p = length(coef(fit_test)) | |
| -2 * logLik(fit_test) + 2 * p | |
| AIC(fit_test) | |
| extractAIC(fit_test) + n + n * log(2 * pi) |
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AIC is being calculated with a different
pdepending on the function used. It is not simply an issue of omitting a constant.