mutate_delta: Mutate delta variable

In wfmueller29/SLAM: SLAM - Functions for Longitduinal Datasets

Mutate delta variable

Description

This function will create a delta variable given a subject id, variable name and dataframe. It will also skip NA values in the calculation of the delta.

Usage

mutate_delta(
  data,
  cols,
  id,
  time,
  fill = 0,
  n = 1L,
  type = "lag",
  prefix = paste("delta", type, n, sep = "_")
)

Arguments

data	the dataframe to be called
cols	the character string or character vector of columns to apply this function to
id	a character string specifying the name of the id variable
time	a character stirng the time variable
fill	numeric or NA to specifying what to fill the values that fall outside the offset window. For example, if we ar taking lagged differences, this will set the value of the firt observation.
n	number of steps to alter rolling difference window
type	character string whether lead or lag should be used
prefix	a character string denothing the prefix of the delta column. The column name for the new delta column will be "prefix_oldname"

Author(s)

Jorge Martinez Romero, William Mueller

wfmueller29/SLAM documentation built on April 5, 2025, 5:09 a.m.