sitar: dfset – R documentation

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dfset

Find degrees of freedom for a natural spline curve to minimise BIC or AIC

dfset fits a natural cubic spline for a range of degrees of freedom, and returns the df minimising the BIC or AIC.

dfset(x, y, data = parent.frame(), FUN = BIC, df = 1:15, plot = FALSE, ...)

`x`	vector of x coordinates.
`y`	vector of y coordinates.
`data`	environment containing `x` and `y`.
`FUN`	function to be minimised (e.g. BIC or AIC).
`df`	vector of degrees of freedom to be searched.
`plot`	logical controlling plotting of FUN versus df.
`...`	parameters to pass to `plot`.

degrees of freedom and value of FUN at minimum.

data(heights)
dfset(age, height, heights, FUN=BIC, plot=TRUE)
dfset(age, height, heights, FUN=function(a) AIC(a, k=1))

Super Imposition by Translation and Rotation Growth Curve Analysis

v1.2.0

GPL (>= 2)

Authors

Tim Cole [aut, cre] (<https://orcid.org/0000-0001-5711-8200>)

Initial release