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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 computationMon, 17 Oct 2011 13:35:50 -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/17/t1318872980vzz2h3ezydogy95.htm/, Retrieved Mon, 20 Apr 2026 22:53:44 +0000
Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?pk=130775, Retrieved Mon, 20 Apr 2026 22:53:44 +0000
QR Codes:

Original text written by user:
IsPrivate?No (this computation is public)
User-defined keywords
Estimated Impact365

Tree of Dependent Computations

Family? (F = Feedback message, R = changed R code, M = changed R Module, P = changed Parameters, D = changed Data)
-     [Cronbach Alpha] [Intrinsic Motivat...] [2010-10-12 11:40:37] [b98453cac15ba1066b407e146608df68]
- R  D    [Cronbach Alpha] [] [2011-10-17 17:35:50] [2e63149daec6ba44c7d6fab36a0b0c34] [Current]
-    D      [Cronbach Alpha] [] [2011-10-17 17:40:03] [74be16979710d4c4e7c6647856088456]
-    D      [Cronbach Alpha] [] [2011-10-17 17:41:44] [74be16979710d4c4e7c6647856088456]
- R         [Cronbach Alpha] [] [2011-10-17 18:05:14] [0fa8c500575976cf9d2f7efbe256ddfb]
- R  D      [Cronbach Alpha] [] [2011-10-17 18:06:45] [0fa8c500575976cf9d2f7efbe256ddfb]
- R  D      [Cronbach Alpha] [] [2011-10-17 18:07:55] [0fa8c500575976cf9d2f7efbe256ddfb]
- RMPD      [Maximum-likelihood Fitting - Normal Distribution] [] [2011-10-17 18:29:58] [0fa8c500575976cf9d2f7efbe256ddfb]
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Dataset

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

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'George Udny Yule' @ yule.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 & 'George Udny Yule' @ yule.wessa.net \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=130775&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]'George Udny Yule' @ yule.wessa.net[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=130775&T=0

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=130775&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'George Udny Yule' @ yule.wessa.net






Cronbach Alpha and Related Statistics
ItemsCronbach AlphaStd. AlphaG6(smc)Average R
All itmes0.7710.76870.74830.4538
Q2 excluded0.8290.83570.77530.6289
Q9 excluded0.68170.67890.63130.4134
Q16 excluded0.68650.68160.64480.4165
Q23 excluded0.6280.62440.56620.3565

\begin{tabular}{lllllllll}
\hline
Cronbach Alpha and Related Statistics \tabularnewline
Items & Cronbach Alpha & Std. Alpha & G6(smc) & Average R \tabularnewline
All itmes & 0.771 & 0.7687 & 0.7483 & 0.4538 \tabularnewline
Q2 excluded & 0.829 & 0.8357 & 0.7753 & 0.6289 \tabularnewline
Q9 excluded & 0.6817 & 0.6789 & 0.6313 & 0.4134 \tabularnewline
Q16 excluded & 0.6865 & 0.6816 & 0.6448 & 0.4165 \tabularnewline
Q23 excluded & 0.628 & 0.6244 & 0.5662 & 0.3565 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=130775&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]0.771[/C][C]0.7687[/C][C]0.7483[/C][C]0.4538[/C][/ROW]
[ROW][C]Q2 excluded[/C][C]0.829[/C][C]0.8357[/C][C]0.7753[/C][C]0.6289[/C][/ROW]
[ROW][C]Q9 excluded[/C][C]0.6817[/C][C]0.6789[/C][C]0.6313[/C][C]0.4134[/C][/ROW]
[ROW][C]Q16 excluded[/C][C]0.6865[/C][C]0.6816[/C][C]0.6448[/C][C]0.4165[/C][/ROW]
[ROW][C]Q23 excluded[/C][C]0.628[/C][C]0.6244[/C][C]0.5662[/C][C]0.3565[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=130775&T=1

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=130775&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 itmes0.7710.76870.74830.4538
Q2 excluded0.8290.83570.77530.6289
Q9 excluded0.68170.67890.63130.4134
Q16 excluded0.68650.68160.64480.4165
Q23 excluded0.6280.62440.56620.3565


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')