poly_add_columns: Add orthogonal polynomial columns to a dataframe

In polypoly: Helper Functions for Orthogonal Polynomials

Add orthogonal polynomial columns to a dataframe

Description

Add orthogonal polynomial columns to a dataframe

Usage

poly_add_columns(
  .data,
  .col,
  degree = 1,
  prefix = NULL,
  scale_width = NULL,
  na_values = c("error", "warn", "allow")
)

Arguments

.data	a dataframe
.col	a bare column name
degree	number of polynomial terms to add to the dataframe
prefix	prefix for the names to add to the dataframe. default is the name of .col.
scale_width	optionally rescale the dataframe using poly_rescale(). Default behavior is not to perform any rescaling.
na_values	How to handle missing values. Default is "error" which raises an error. Other options include "warn" to raise a warning and "allow" to silently accept missing values.

Value

the dataframe with additional columns of orthogonal polynomial terms of .col

Examples

df <- data.frame(time = rep(1:5, 3), y = rnorm(15))

# adds columns "time1", "time2", "time3"
poly_add_columns(df, time, degree = 3)

# adds columns "t1", "t2", "t3 and rescale
poly_add_columns(df, time, degree = 3, prefix = "t", scale_width = 1)

polypoly documentation built on Oct. 20, 2022, 9:05 a.m.