Select starting knots for multi-level factor interaction — selectFctrStartk • MRSea

This function finds a number of starting knot locations for different factor levels and is used for creating an interaction term.

Usage

selectFctrStartk(knots, nk, s.eed = 1)

Arguments

knots: Coordinates of the knot locations in columns 1 and 2 and the associated factor level in the third.
nk: The number of knots to be selected for each factor level. This may be a single number (for all factor levels) or a vector of numbers to allow a different number of knots to be selected for each factor level.
s.eed: default = 1. Set the seed for the selection to ensure reproducibility.

Details

The function returns the row number of the knots parameter for the selected knots.

Examples


#' # load data
data(nysted.analysisdata)

myknots <- selectFctrKnots(nysted.analysisdata[,c('x.pos', 'y.pos', 'impact')], 
                           nk=150)
startknotlocs <- selectFctrStartk(myknots, nk=5, s.eed = 4)