getBootCIalpha: function returning observed Cronbach alpha with bootstrap...

In cpsyctc/CECPfuns: Package of Utility Functions for Psychological Therapies, Mental Health and Well-being Work (Created by Chris Evans and Clara Paz)

Description

function returning observed Cronbach alpha with bootstrap confidence interval around that value

Usage

getBootCIalpha(
  dat,
  verbose = TRUE,
  na.rm = TRUE,
  nLT20err = TRUE,
  nGT10kerr = TRUE,
  bootReps = 1000,
  conf = 0.95,
  bootCImethod = c("perc", "norm", "basic", "bca")
)

Arguments

dat	data, matrix, data frame or tibble and numeric item data as columns
verbose	logical, if FALSE switches off messages
na.rm	logical which causes function to throw error if there is missing data
nLT20err	logical, throws error if length(na.omit(dat)) < 20, otherwise returns NA for CI
nGT10kerr	logical, throws error if length(na.omit(dat)) > 10k to prevent very long rusn, override with FALSE
bootReps	integer for number of bootstrap replications
conf	numeric confidence interval desired as fraction, e.g. .95
bootCImethod	method of deriving bootstrap CI from "perc", "norm", "basic" or "bca"

Value

list of length 3: obsAlpha, LCLAlpha and UCLAlpha

History/development log

Started before 5.iv.21

Author(s)

Chris Evans

See Also

Other bootstrap CI functions: getBootCICSC(), getBootCICorr(), getBootCIgrpMeanDiff(), getBootCImean()

Other Chronbach alpha functions: getChronbachAlpha()

Examples

## Not run: 
set.seed(12345)
tmpMat <- matrix(rnorm(200), ncol = 10)
tmpDat <- as.data.frame(tmpMat)
tmpTib <- as_tibble(tmpDat)

### all default arguments
getBootCIalpha (tmpMat)

## End(Not run)

cpsyctc/CECPfuns documentation built on Dec. 26, 2021, 1:19 p.m.