Select Items from 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

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)

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
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> library(Scale)
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, round.POSIXt, trunc.POSIXt, units

Loading required package: MASS
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/Scale/ChooseBest.Rd_%03d_medium.png", width=480, height=480)
> ### Name: ChooseBest
> ### Title: Select Items from Item Analysis.
> ### Aliases: ChooseBest
> ### Keywords: survey multivariate
> 
> ### ** 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)
Warning message:
In PreProc(depressionScale) :
  Items' vector unspecified. out$items is NULL...
> 
> depressionRel <- ItemAnalysis(depressionPre)
> 
> depressionItems <- ChooseBest(depressionRel)
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>