scan (version 0.64.0)

add_dummy_variables: Add Dummy Variables for Piecewise Linear Models

Description

Adds dummy variables to an scdf for calculating piecewise linear models.

Usage

add_dummy_variables(
  scdf,
  model = c("W", "H-M", "B&L-B"),
  contrast_level = c("first", "preceding"),
  contrast_slope = c("first", "preceding")
)

Arguments

scdf

A single-case data frame. See scdf() to learn about this format.

model

Model used for calculating the dummy parameters (see Huitema & McKean, 2000). Default is model = "W". Possible values are: "B&L-B", "H-M", "W", and deprecated "JW".

contrast_level

Either "first", "preceding" or a contrast matrix. If NA contrast_level is a copy of contrast.

contrast_slope

Either "first", "preceding" or a contrast matrix. If NA contrast_level is a copy of contrast.

Examples

add_dummy_variables(
 scdf = exampleABC, 
 model = "W", 
 contrast_level = "first", 
 contrast_slope = "first"
)