Calculate a scale. — calculateScale • eatGADS

Calculate a scale variable based on multiple items.

Usage

calculateScale(
  GADSdat,
  items,
  scale,
  maxNA = length(items),
  reportDescr = FALSE
)

Arguments

GADSdat: A data.frame or GADSdat object.
items: A character vector with all item variable names.
scale: A character vector with the scale name.
maxNA: Maximum number of allowed NA values on the items.
reportDescr: Should descriptive statistics be reported for the calculated scale.

Value

Returns a GADSdat containing the newly computed variable.

Details

Descriptive statistics (including Cronbach's alpha, credit to the psy package) are calculated and printed to the console. The new scale variable is automatically inserted right after the last item in the original GADSdat.

Examples

##
items <- paste0("norms_", letters[1:6])
pisa_new <- calculateScale(pisa, items = items, scale = "norms")