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Estimate or extract residual or model-based degrees of freedom from regression models.
get_df(x, ...)# S3 method for default
get_df(x, type = "residual", verbose = TRUE, ...)
A statistical model.
Currently not used.
Can be "residual", "model" or "analytical". "residual"
tries to extract residual degrees of freedoms. If residual degrees of freedom
could not be extracted, returns analytical degrees of freedom, i.e. n-k
(number of observations minus number of parameters). "model" returns
model-based degrees of freedom, i.e. the number of (estimated) parameters.
Toggle warnings.
# NOT RUN {
model <- lm(Sepal.Length ~ Petal.Length * Species, data = iris)
get_df(model) # same as df.residual(model)
get_df(model, type = "model") # same as attr(logLik(model), "df")
# }
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