scaleScores: Compute scale scores

In GiulioCostantini/markerIndex: markerIndex: computes the marker index proposed by Perugini and Gallucci (2007); includes also a collection of utility functions

Description

Compute scale scores exploiting regularities in the item names.

Usage

scaleScores(data, pattern, recode = FALSE, recString = "_r", min = 1,
max = 5, na.rm = TRUE)

Arguments

data	A dataframe.
pattern	A list of named items. Each element of the list identifies a set of items composing a scale, through a vector of strings. Each scale is identified by a vector of strings. All items whose names include all the strings specified in the vector are included in the scale.
recode	Logical. Whether reverse-coded items should be recoded before estimating reliability.
recString	A string that identifies reverse-coded items, by default "_r". Be careful: if recode = TRUE, all items including this string in their names will be recoded.
min	The lowest point of the response scale
max	The highest point of the response scale
na.rm	Whether NAs should be removed before computing scale score

Value

A dataframe of scale scores

Author(s)

Giulio Costantini

Examples

library(psychTools)
data(bfi)

# bfi.keys include information on reverse-scoring. In particular, items with the string
# "-" are reverse-scored. We can exploit this information to reverse-score all items
bfi2 <- bfi
names(bfi2)[1:25] <- c("-A1", "A2",  "A3",  "A4",  "A5",
                       "C1",  "C2",  "C3",  "-C4", "-C5",
                       "-E1", "-E2", "E3",  "E4",  "E5" ,
                       "N1", "N2", "N3", "N4", "N5",
                       "O1",  "-O2", "O3",  "O4", "-O5")

# scale scores can be computed with function scaleScores
BFI <- scaleScores(bfi2, pattern = list(
  "Openness" = c("O"),
  "Conscientiousness" = c("C"),
  "Extraversion" = c("E"),
  "Agreeableness" = c("A"),
  "Neuroticism" = c("N")),
  recode = TRUE,
  recString = "-",
  min = 1, max = 6)
head(BFI)

GiulioCostantini/markerIndex documentation built on March 3, 2021, 5:58 a.m.