ChooseBest: Select Items from Item Analysis.

In Scale: Likert Type Questionnaire Item Analysis

Description

Takes an ItemAnalysis object, and returns the column names, i.e. the item labels of those items that load the highest on the single factor. Defaults to 5 items.

Usage

ChooseBest(it, n=5)

Arguments

it	An ItemAnalysis object, produced by the ItemAnalysis() function.
n	The number of items to select. Asking for more items than available leads to an error.

Value

A character vector, with the labels of the items, as defined in ScaleData object.

Author(s)

Nikolaos Giallousis

Examples

data(Depression98)
depressionScale <- Scale(data=Depression98, 
                         orders=list(
                           c(16,19,11,9,1,17,5,18,4,8,2,12,
                             20,10,14,6,3,13,15,7),
                           c(1,18,4,15,7,8,3,14,20,6,19,16,
                             12,5,10,13,2,17,11,9)),
                         orders_id=c(
                           rep(1, 49),
                           rep(2, 49)),
                         reverse=c(3,4,13,14,18,20),
                         col_names= paste('q', 1:20, sep=''))
depressionPre <- PreProc(depressionScale)

depressionRel <- ItemAnalysis(depressionPre)

depressionItems <- ChooseBest(depressionRel)

Example output

Loading required package: psych
Loading required package: Hmisc
Loading required package: lattice
Loading required package: survival
Loading required package: Formula
Loading required package: ggplot2

Attaching package: 'ggplot2'

The following objects are masked from 'package:psych':

    %+%, alpha


Attaching package: 'Hmisc'

The following object is masked from 'package:psych':

    describe

The following objects are masked from 'package:base':

    format.pval, units

Loading required package: MASS
Warning message:
In PreProc(depressionScale) :
  Items' vector unspecified. out$items is NULL...

Scale documentation built on May 2, 2019, 1:27 p.m.