Xcontrast: Xcontrast

In rms: Regression Modeling Strategies

Xcontrast

Description

Produce Design Matrices for Contrasts

Usage

Xcontrast(
  fit,
  a,
  b = NULL,
  a2 = NULL,
  b2 = NULL,
  ycut = NULL,
  weights = "equal",
  expand = TRUE
)

Arguments

fit	an 'rms' or 'rmsb' fit object, not necessarily complete
a	see [rms::contrast.rms()]
b	see [rms::contrast.rms()]
a2	see [rms::contrast.rms()]
b2	see [rms::contrast.rms()]
ycut	see [rms::contrast.rms()]
weights	see [rms::contrast.rms()]
expand	see [rms::contrast.rms()]

Details

This is a simpler version of 'contrast.rms' that creates design matrices or differences of them and does not require the fit object to be complete (i.e., to have coefficients). This is used for the 'pcontrast' option in [rmsb::blrm()].

Value

numeric matrix

Author(s)

Frank Harrell

rms documentation built on Sept. 12, 2023, 9:07 a.m.