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Description of Statistical Computation

Author's title

Author*The author of this computation has been verified*
R Software Modulerwasp_cronbach.wasp
Title produced by softwareCronbach Alpha
Date of computationFri, 14 Oct 2011 03:31:54 -0400
Cite this page as followsStatistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?v=date/2011/Oct/14/t1318577569p31rxmn2no7twr0.htm/, Retrieved Mon, 27 Apr 2026 06:35:27 +0000
Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?pk=129239, Retrieved Mon, 27 Apr 2026 06:35:27 +0000
QR Codes:

Original text written by user:
IsPrivate?No (this computation is public)
User-defined keywords
Estimated Impact416

Tree of Dependent Computations

Family? (F = Feedback message, R = changed R code, M = changed R Module, P = changed Parameters, D = changed Data)
-     [Maximum-likelihood Fitting - Normal Distribution] [Intrinsic Motivat...] [2010-10-12 11:57:21] [b98453cac15ba1066b407e146608df68]
- RM D    [Cronbach Alpha] [Ws 3 - task 2] [2011-10-14 07:31:54] [8e74b77f6c0ad21b554439c4ef29c61b] [Current]
- RM        [Cronbach Alpha] [] [2011-10-25 14:21:26] [86a47bcc75cd2e0d5b5c9888edc893c2]
- R         [Cronbach Alpha] [] [2011-10-25 14:22:57] [86a47bcc75cd2e0d5b5c9888edc893c2]
- RMPD      [Testing Mean with unknown Variance - Critical Value] [] [2011-10-25 14:47:50] [86a47bcc75cd2e0d5b5c9888edc893c2]
- RMPD      [Testing Mean with unknown Variance - Critical Value] [] [2011-10-25 14:58:09] [86a47bcc75cd2e0d5b5c9888edc893c2]
- RMPD      [Testing Mean with known Variance - Sample Size] [] [2011-10-25 15:21:53] [86a47bcc75cd2e0d5b5c9888edc893c2]
- RMPD      [Testing Mean with known Variance - Sample Size] [] [2011-10-25 15:24:41] [86a47bcc75cd2e0d5b5c9888edc893c2]
- RMPD      [One Sample Tests about the Mean] [] [2011-10-25 15:36:21] [86a47bcc75cd2e0d5b5c9888edc893c2]
- RMPD      [One Sample Tests about the Mean] [] [2011-10-25 15:38:59] [86a47bcc75cd2e0d5b5c9888edc893c2]
- RMPD      [Variability] [] [2011-10-25 15:46:07] [86a47bcc75cd2e0d5b5c9888edc893c2]
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Dataset

Dataseries X:
Download CSV
Histogram
Boxplots 
7	7	7	5
5	5	5	5
6	5	4	4
4	5	5	5
5	5	5	5
6	6	6	7
7	4	7	7
6	5	5	6
6	7	7	6
6	5	5	6
5	2	4	6
5	5	6	6
4	5	4	6
6	6	6	6
6	6	7	7
5	5	6	5
3	3	4	3
7	6	6	7
3	5	6	6
5	5	6	6
3	3	4	4
5	5	5	6
2	1	2	2
6	5	6	6
3	4	5	5
6	6	6	7
6	6	6	7
5	4	5	5
5	4	5	6
7	5	5	6
6	4	6	6
5	5	6	6
5	6	5	5
4	3	4	4
4	5	6	5
6	5	5	6
5	3	5	5
5	5	5	5
7	7	7	7
5	6	5	6
5	4	5	4
6	5	7	5
5	5	5	5
6	6	7	6
7	7	6	6
5	3	3	4
5	4	4	4
5	6	6	6
6	5	5	5
2	2	4	5
4	4	4	6
4	4	6	5
6	5	5	6
3	4	4	5
6	6	6	6
6	2	5	5
5	4	5	6
6	6	6	6
1	4	6	3
5	5	6	6
7	6	5	6
4	4	5	5
5	6	5	5
6	6	5	6
4	5	4	4
6	6	5	5
6	6	6	6
5	4	6	6
5	6	5	6
3	3	5	5
5	5	5	6
6	5	6	6
5	5	6	6
6	6	6	6
6	6	6	6
4	4	4	4
4	4	4	4
6	5	5	5
7	6	6	7
4	3	3	5
5	6	7	7
6	2	5	5
6	5	6	6
5	3	6	6
3	4	5	5
7	6	6	6
6	5	6	7
4	4	4	5
4	5	6	4
5	5	5	5
3	4	4	4
7	7	7	6
6	4	6	6
6	6	6	5
4	4	4	4
5	4	5	5
6	6	6	7
5	3	5	6
6	4	4	5
6	7	7	6
4	5	6	6
5	5	5	5
6	6	6	6
5	5	6	6
5	5	5	5
4	4	5	5
4	5	5	4
6	6	5	7
5	5	7	7
6	5	6	5
5	4	7	7
6	4	6	6
5	5	5	5
4	5	4	5
6	6	6	7
4	5	4	5
5	3	3	5
5	5	5	5
6	3	5	5
3	4	5	3
5	4	5	5
4	5	5	5
5	2	5	4
5	5	3	4
7	7	7	7
5	6	6	6
7	6	6	6
5	5	4	6
4	4	4	5
6	6	6	5
4	3	4	5
4	7	6	6
4	3	2	2
4	4	5	5
6	6	5	7
6	5	6	6
5	6	5	5
3	4	4	5
6	6	6	6
5	6	6	6
4	4	5	5
5	5	5	5
2	3	2	2
5	6	6	7
7	5	6	7
4	6	5	5
4	5	6	6
7	6	7	5
6	5	5	6
5	6	5	5
5	5	5	6
5	5	6	6
7	6	7	7
6	5	7	6
6	6	6	6
5	5	5	6
2	4	6	6
4	4	4	4
6	4	6	6
5	5	6	4
5	4	4	5
5	5	5	5

Tables (Output of Computation)





Summary of computational transaction
Raw Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time1 seconds
R Server'Herman Ole Andreas Wold' @ wold.wessa.net

\begin{tabular}{lllllllll}
\hline
Summary of computational transaction \tabularnewline
Raw Input & view raw input (R code)  \tabularnewline
Raw Output & view raw output of R engine  \tabularnewline
Computing time & 1 seconds \tabularnewline
R Server & 'Herman Ole Andreas Wold' @ wold.wessa.net \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=129239&T=0

[TABLE]
[ROW][C]Summary of computational transaction[/C][/ROW]
[ROW][C]Raw Input[/C][C]view raw input (R code) [/C][/ROW]
[ROW][C]Raw Output[/C][C]view raw output of R engine [/C][/ROW]
[ROW][C]Computing time[/C][C]1 seconds[/C][/ROW]
[ROW][C]R Server[/C][C]'Herman Ole Andreas Wold' @ wold.wessa.net[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=129239&T=0

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=129239&T=0

As an alternative you can also use a QR Code:  
QR Code


The GUIDs for individual cells are displayed in the table below:

Summary of computational transaction
Raw Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time1 seconds
R Server'Herman Ole Andreas Wold' @ wold.wessa.net






Cronbach Alpha and Related Statistics
ItemsCronbach AlphaStd. AlphaG6(smc)Average R
All itmes0.84250.84590.81150.5785
Q2 excluded0.81360.81730.75540.5986
Q9 excluded0.81270.81740.75530.5988
Q16 excluded0.7880.79090.71790.5577
Q23 excluded0.78920.79160.71870.5587

\begin{tabular}{lllllllll}
\hline
Cronbach Alpha and Related Statistics \tabularnewline
Items & Cronbach Alpha & Std. Alpha & G6(smc) & Average R \tabularnewline
All itmes & 0.8425 & 0.8459 & 0.8115 & 0.5785 \tabularnewline
Q2 excluded & 0.8136 & 0.8173 & 0.7554 & 0.5986 \tabularnewline
Q9 excluded & 0.8127 & 0.8174 & 0.7553 & 0.5988 \tabularnewline
Q16 excluded & 0.788 & 0.7909 & 0.7179 & 0.5577 \tabularnewline
Q23 excluded & 0.7892 & 0.7916 & 0.7187 & 0.5587 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=129239&T=1

[TABLE]
[ROW][C]Cronbach Alpha and Related Statistics[/C][/ROW]
[ROW][C]Items[/C][C]Cronbach Alpha[/C][C]Std. Alpha[/C][C]G6(smc)[/C][C]Average R[/C][/ROW]
[ROW][C]All itmes[/C][C]0.8425[/C][C]0.8459[/C][C]0.8115[/C][C]0.5785[/C][/ROW]
[ROW][C]Q2 excluded[/C][C]0.8136[/C][C]0.8173[/C][C]0.7554[/C][C]0.5986[/C][/ROW]
[ROW][C]Q9 excluded[/C][C]0.8127[/C][C]0.8174[/C][C]0.7553[/C][C]0.5988[/C][/ROW]
[ROW][C]Q16 excluded[/C][C]0.788[/C][C]0.7909[/C][C]0.7179[/C][C]0.5577[/C][/ROW]
[ROW][C]Q23 excluded[/C][C]0.7892[/C][C]0.7916[/C][C]0.7187[/C][C]0.5587[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=129239&T=1

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=129239&T=1

As an alternative you can also use a QR Code:  
QR Code


The GUIDs for individual cells are displayed in the table below:

Cronbach Alpha and Related Statistics
ItemsCronbach AlphaStd. AlphaG6(smc)Average R
All itmes0.84250.84590.81150.5785
Q2 excluded0.81360.81730.75540.5986
Q9 excluded0.81270.81740.75530.5988
Q16 excluded0.7880.79090.71790.5577
Q23 excluded0.78920.79160.71870.5587


Figures (Output of Computation)

Input Parameters & R Code

Parameters (Session):
Parameters (R input):
R code (references can be found in the software module):
library(psych)
z <- t(y)
(r <- alpha(z))
load(file='createtable')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a,'Cronbach Alpha and Related Statistics',5,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Items',1,TRUE)
a<-table.element(a,'Cronbach Alpha',1,TRUE)
a<-table.element(a,'Std. Alpha',1,TRUE)
a<-table.element(a,'G6(smc)',1,TRUE)
a<-table.element(a,'Average R',1,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'All itmes',header=TRUE)
a<-table.element(a,round(r$total['raw_alpha'],4))
a<-table.element(a,round(r$total['std.alpha'],4))
a<-table.element(a,round(r$total['G6(smc)'],4))
a<-table.element(a,round(r$total['average_r'],4))
a<-table.row.end(a)
n = length(z[1,])
for (i in 1:n) {
a<-table.row.start(a)
a<-table.element(a,paste(colnames(z)[i],' excluded',sep=''),header=TRUE)
a<-table.element(a,round(r$alpha.drop[i,'raw_alpha'],4))
a<-table.element(a,round(r$alpha.drop[i,'std.alpha'],4))
a<-table.element(a,round(r$alpha.drop[i,'G6(smc)'],4))
a<-table.element(a,round(r$alpha.drop[i,'average_r'],4))
a<-table.row.end(a)
}
a<-table.end(a)
table.save(a,file='mytable.tab')