r - Box.test "Ljung-Box"

Question

I am studying the Box.test and I would like to understand the parameters:

Usage Box.test(x, lag = 1, type = c("Box-Pierce", "Ljung-Box"), fitdf = 0) Arguments x a numeric vector or univariate time series.

lag the statistic will be based on lag autocorrelation coefficients.

type test to be performed: partial matching is used.

fitdf number of degrees of freedom to be subtracted if x is a series of residuals

Can anyone explain to me the lag and fitdf in this test ? I am testing the independance of the residuals in a time serie.

question from:https://stackoverflow.com/questions/65871818/box-test-ljung-box

Answer 1

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