item.scale: Functions to form a scale from a set of survey items

In rwash/surveys: Functions to assist with loading and analyzing surveys

Functions to form a scale from a set of survey items

Description

Combines multiple items, specified using a formula interface, into a single "scale"

Usage

item.scale(
  formula,
  data = NULL,
  subset = NULL,
  na.action = na.pass,
  drop.unused.levels = F,
  scale.fun = mean,
  standard = FALSE,
  numeric = FALSE,
  ...
)

Arguments

formula	A formula specifying the items to combine into a scale Should be of the form ~ item1 + item2 + item3
data	The data frame to use to get the data from
subset	Specifies if only a specific subset of the data should be used
na.action	What should be done with NAs?
scale.fun	which function to compose the scale. examples include sum, mean
standard	should the individual items be standardized before inclusion in the scale?
numeric	should the individual items be cast into numeric before inclusion in the scale?
...	currently unused
drop.unused.level	If factors are being combined, should we only include levels that are actually used?

Value

An object of type item.scale. This is fundamentally a vector, and can be used as such. It has a number of additional attributes (such as cronbach) that are useful in future calculations and functions

rwash/surveys documentation built on Sept. 18, 2023, 11:31 p.m.