ds.lspline {dsBaseClient}

R Documentation

Basis for a piecewise linear spline with meaningful coefficients

Description

This function is based on the native R function lspline from the lspline package. This function computes the basis of piecewise-linear spline such that, depending on the argument marginal, the coefficients can be interpreted as (1) slopes of consecutive spline segments, or (2) slope change at consecutive knots.

Usage

ds.lspline(
  x,
  knots = NULL,
  marginal = FALSE,
  names = NULL,
  newobj = NULL,
  datasources = NULL
)

Arguments

x	the name of the input numeric variable
knots	numeric vector of knot positions
marginal	logical, how to parametrize the spline, see Details
names	character, vector of names for constructed variables
newobj	a character string that provides the name for the output variable that is stored on the data servers. Default lspline.newobj.
datasources	a list of DSConnection-class objects obtained after login. If the datasources argument is not specified the default set of connections will be used: see datashield.connections_default.

Details

If marginal is FALSE (default) the coefficients of the spline correspond to slopes of the consecutive segments. If it is TRUE the first coefficient correspond to the slope of the first segment. The consecutive coefficients correspond to the change in slope as compared to the previous segment.

Value

an object of class "lspline" and "matrix", which its name is specified by the newobj argument (or its default name "lspline.newobj"), is assigned on the serverside.

Author(s)

Demetris Avraam for DataSHIELD Development Team

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