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Author's title

Author

*The author of this computation has been verified*

R Software Module

Ian.Hollidayrwasp_Tests to Compare Two Means.wasp

Title produced by software

T-Tests

Date of computation

Tue, 09 Nov 2010 11:12:43 +0000

Cite this page as follows

Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?v=date/2010/Nov/09/t1289301111m2lf1yksoyzb9m2.htm/, Retrieved Fri, 23 May 2025 15:08:51 +0000

Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?pk=92921, Retrieved Fri, 23 May 2025 15:08:51 +0000

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Original text written by user:

IsPrivate?

No (this computation is public)

User-defined keywords

Estimated Impact

593

Family? (F = Feedback message, R = changed R code, M = changed R Module, P = changed Parameters, D = changed Data)

-     [Aston University Statistical Software] [Morning Sickness ...] [2009-11-16 16:26:06] [74be16979710d4c4e7c6647856088456]
- R     [Aston University Statistical Software] [Morning Sickness ...] [2009-11-16 17:22:16] [74be16979710d4c4e7c6647856088456]
-   P       [T-Tests] [Morning Sickness ...] [2010-11-09 11:12:43] [72e70820461d0e77268e06309fbe41c7] [Current]
-             [T-Tests] [] [2010-11-09 19:44:22] [5f3db3d90d126a95d54183950148004f] 
-             [T-Tests] [scenario 1] [2010-11-11 12:38:34] [a88d4f8d31dfea292b0820825eeec6b4] 
-             [T-Tests] [] [2010-11-11 12:35:57] [b934562a0aeb1ba3c345b4d88f685c0c] 
-   P         [T-Tests] [Week 6 comp. case 1] [2010-11-11 12:42:10] [dce9abd8694db4553090ea486e4bc791] 
-             [T-Tests] [1] [2010-11-11 12:44:52] [b827aeabc9657b59090cdbe9205e45c8] 
-             [T-Tests] [] [2010-11-11 12:46:36] [b48f5f730c5d512b3990977e77ceb182] 
-   P         [T-Tests] [compedium 6] [2010-11-11 12:58:28] [2736edfd04acceff7ef750b1b52381c2] 
-   P           [T-Tests] [compedium 6] [2010-11-11 13:23:18] [2736edfd04acceff7ef750b1b52381c2] 
-   P         [T-Tests] [] [2010-11-11 12:58:01] [74be16979710d4c4e7c6647856088456] 
-   P         [T-Tests] [Drug trials of mo...] [2010-11-11 13:12:56] [b3d3d2a4e3813ea6c4a04808e1fc1271] 
-             [T-Tests] [morning sickness ...] [2010-11-11 13:29:45] [dce042b1b27996875f80ca8f180ea409] 
-             [T-Tests] [compendium 6] [2010-11-11 13:33:13] [1c0689626c7c7484f03683a6bd9607af] 
-             [T-Tests] [Pregancy morning ...] [2010-11-11 13:31:07] [bbe2ba08a2e1004d231616e60eeea4d7] 
-             [T-Tests] [morning sickness ...] [2010-11-11 13:34:51] [eb8597fb4247e541f248d83c31d21a58] 
-             [T-Tests] [] [2010-11-11 13:43:58] [74be16979710d4c4e7c6647856088456] 
-             [T-Tests] [] [2010-11-11 13:46:56] [ead37655c849d69b7e121dfe16ee54a5] 
-   P         [T-Tests] [Week 6 Scenario 1] [2010-11-11 17:16:27] [dddf47df3158f3415096d83fcbb31970] 
-             [T-Tests] [W6 C Scen 1] [2010-11-12 11:46:05] [56deace5afbbe22352c3841e29b79134] 
-             [T-Tests] [] [2010-11-12 12:00:41] [b48f5f730c5d512b3990977e77ceb182] 
-             [T-Tests] [scenario 1] [2010-11-12 11:36:58] [4ff27dd7c583dd02fd8841b940d8c8a4] 
-   P         [T-Tests] [My Compendium Week 6] [2010-11-12 12:04:22] [abe244594d47c647168999d9ae7a699b] 
-   P         [T-Tests] [My Compendium Week 6] [2010-11-12 12:07:26] [abe244594d47c647168999d9ae7a699b] 
-             [T-Tests] [Week 6 compendium...] [2010-11-12 14:20:50] [88bba52b01540967ecde38774018061d] 
-               [T-Tests] [] [2010-11-19 09:58:23] [88bba52b01540967ecde38774018061d] 
- R  D          [T-Tests] [t test] [2011-05-29 17:38:02] [88bba52b01540967ecde38774018061d] 
- RMPD            [Correlation] [correlation] [2011-05-29 18:08:41] [88bba52b01540967ecde38774018061d] 
- R                 [Correlation] [spearman] [2011-05-29 18:11:55] [88bba52b01540967ecde38774018061d] 
-                     [Correlation] [spearman] [2011-05-29 18:15:43] [88bba52b01540967ecde38774018061d] 
-   PD            [T-Tests] [compare female] [2011-05-30 17:56:07] [88bba52b01540967ecde38774018061d] 
-             [T-Tests] [Morning Sickness ...] [2010-11-12 14:45:56] [a213e16b9aee3f49d2cb9e790c69a2a0] 
-             [T-Tests] [week6 scenario 1] [2010-11-12 16:23:27] [15d95c9569f1ac5858317a9687e82457] 
-               [T-Tests] [] [2010-11-16 15:28:03] [19600d31edce75009224fbecf9086a65] 
-   P         [T-Tests] [scenario1] [2010-11-12 17:21:38] [4093a2c62080069188d221a6234554ac] 
-   P         [T-Tests] [scenario1attempt2] [2010-11-12 18:45:26] [4093a2c62080069188d221a6234554ac] 
-   P           [T-Tests] [scenario1attempt3] [2010-11-14 18:29:58] [4093a2c62080069188d221a6234554ac] 
-             [T-Tests] [Independent T tes...] [2010-11-12 19:27:00] [0aad37657179c4ab6867a73eb1b2180e] 
-             [T-Tests] [New Drug - scenar...] [2010-11-12 21:26:44] [b3b4b2549173c036f02fb7e9febb1d26] 
-   P         [T-Tests] [new drug] [2010-11-12 22:45:08] [b3b4b2549173c036f02fb7e9febb1d26] 
-             [T-Tests] [compendium 6] [2010-11-12 22:49:40] [1a8e34d31778cea87d7e7a201d42c24e] 
-               [T-Tests] [week 6 drug placebo] [2010-11-16 13:40:38] [6394f795723b5675987dce90464253e0] 
-   PD          [T-Tests] [graph 1] [2011-01-21 23:38:13] [1a8e34d31778cea87d7e7a201d42c24e] 
-   PD          [T-Tests] [graph 2] [2011-01-21 23:43:26] [1a8e34d31778cea87d7e7a201d42c24e] 
-             [T-Tests] [scenario 1] [2010-11-13 14:52:17] [0c548e6e127736a7951d896609232775] 
-             [T-Tests] [T-Test Pregnancy] [2010-11-13 18:04:22] [05f6bac91e3f566f17ccf54f910765b8] 
-               [T-Tests] [Pregnancy Boxplot] [2010-11-13 19:32:01] [05f6bac91e3f566f17ccf54f910765b8] 
-   P         [T-Tests] [] [2010-11-13 18:16:27] [74be16979710d4c4e7c6647856088456] 
-             [T-Tests] [scenario1] [2010-11-13 18:11:48] [61f503b2177bafdabe2572a488e9c39b] 
-   P         [T-Tests] [] [2010-11-13 20:46:12] [5f3db3d90d126a95d54183950148004f] 

[Truncated]

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Dataseries X:

Download CSV

Histogram

Boxplots

68.95	70.18
70.84	69.94
70.26	69.61
70.93	71.39
70.71	72.54
70.73	70.48
70.20	70.48
69.76	71.68
71.46	70.59
70.31	71.61
69.24	70.56
70.94	72.74
68.98	72.63
71.16	71.58
69.96	70.14
69.66	71.22
70.20	70.72
69.99	71.37
71.97	69.73
68.29	71.29
67.67	73.19
70.07	70.64
70.89	69.30
69.66	71.76
71.12	70.28
70.60	69.77
70.09	70.37
70.55	71.70
71.63	70.85
69.30	71.07

Summary of computational transaction
Raw Input	view raw input (R code)
Raw Output	view raw output of R engine
Computing time	1 seconds
R Server	'Gwilym Jenkins' @ 72.249.127.135

\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 & 'Gwilym Jenkins' @ 72.249.127.135 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=92921&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]'Gwilym Jenkins' @ 72.249.127.135[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=92921&T=0

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=92921&T=0

As an alternative you can also use a QR Code:

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

Summary of computational transaction
Raw Input	view raw input (R code)
Raw Output	view raw output of R engine
Computing time	1 seconds
R Server	'Gwilym Jenkins' @ 72.249.127.135

T-Test
Mean1	70.204
Mean2	70.98033
T Statistic	-3.08443
P-value	0.00312
Lower Confidence Limit	-1.28016
Upper Confidence Limit	-0.27251

\begin{tabular}{lllllllll}
\hline
T-Test \tabularnewline
Mean1 & 70.204 \tabularnewline
Mean2 & 70.98033 \tabularnewline
T Statistic & -3.08443 \tabularnewline
P-value & 0.00312 \tabularnewline
Lower Confidence Limit & -1.28016 \tabularnewline
Upper Confidence Limit & -0.27251 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=92921&T=1

[TABLE]
[ROW][C]T-Test[/C][/ROW]
[ROW][C]Mean1[/C][C]70.204[/C][/ROW]
[ROW][C]Mean2[/C][C]70.98033[/C][/ROW]
[ROW][C]T Statistic[/C][C]-3.08443[/C][/ROW]
[ROW][C]P-value[/C][C]0.00312[/C][/ROW]
[ROW][C]Lower Confidence Limit[/C][C]-1.28016[/C][/ROW]
[ROW][C]Upper Confidence Limit[/C][C]-0.27251[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=92921&T=1

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=92921&T=1

As an alternative you can also use a QR Code:

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

T-Test
Mean1	70.204
Mean2	70.98033
T Statistic	-3.08443
P-value	0.00312
Lower Confidence Limit	-1.28016
Upper Confidence Limit	-0.27251

Standard Deviations
Variable 1	0.96628
Variable 2	0.98326

\begin{tabular}{lllllllll}
\hline
Standard Deviations \tabularnewline
Variable 1 & 0.96628 \tabularnewline
Variable 2 & 0.98326 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=92921&T=2

[TABLE]
[ROW][C]Standard Deviations[/C][/ROW]
[ROW][C]Variable 1[/C][C]0.96628[/C][/ROW]
[ROW][C]Variable 2[/C][C]0.98326[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=92921&T=2

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=92921&T=2

As an alternative you can also use a QR Code:

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

Standard Deviations
Variable 1	0.96628
Variable 2	0.98326

Figure 1

PNG link

Postscript link

PDF link

Parameters (Session):

par1 = two.sided ; par2 = 1 ; par3 = 2 ; par4 = T-Test ; par5 = unpaired ; par6 = 0.0 ; par7 = .95 ; par8 = TRUE ;

Parameters (R input):

par1 = two.sided ; par2 = 1 ; par3 = 2 ; par4 = T-Test ; par5 = unpaired ; par6 = 0.0 ; par7 = .95 ; par8 = TRUE ;

R code (references can be found in the software module):

par2 <- as.numeric(par2)
par3 <- as.numeric(par3)
par4 <- as.character(par4)
par5 <- as.character(par5)
par6 <- as.numeric(par6)
par7 <- as.numeric(par7)
par8 <- as.logical(par8)
if ( par5 == 'unpaired') paired <- FALSE else paired <- TRUE
x <- t(y)
if(par8){
bitmap(file='test1.png')
(r<-boxplot(x ,xlab=xlab,ylab=ylab,main=main,notch=FALSE,col=2))
dev.off()
}
load(file='createtable')
if( par4 == 'Wilcoxon-Mann_Whitney'){
a<-table.start()
a <- table.row.start(a)
a <- table.element(a,'Wilcoxon Test',3,TRUE)
a <- table.row.end(a)
a <- table.row.start(a)
a <- table.element(a,'',1,TRUE)
a <- table.element(a,'Statistic',1,TRUE)
a <- table.element(a,'P-value',1,TRUE)
a <- table.row.end(a)
W <- wilcox.test(x[,par2],x[,par3],alternative=par1, paired = paired)
a<-table.row.start(a)
a<-table.element(a,'Wilcoxon Test',1,TRUE)
a<-table.element(a,W$statistic[[1]])
a<-table.element(a,round(W$p.value, digits=5) )
a<-table.row.end(a)
a<-table.end(a)
table.save(a,file='mytable.tab')
}
if( par4 == 'T-Test')
{
T <- t.test(x[,par2],x[,par3],alternative=par1, paired=paired, mu=par6, conf.level=par7)
a<-table.start()
a <- table.row.start(a)
a <- table.element(a,'T-Test',3,TRUE)
a <- table.row.end(a)
if(paired){
a <- table.row.start(a)
a <- table.element(a,'Difference: Mean1 - Mean2',1,TRUE)
a<-table.element(a,round(T$estimate, digits=5) )
a <- table.row.end(a)
}
if(!paired){
a <- table.row.start(a)
a <- table.element(a,'Mean1',1,TRUE)
a<-table.element(a,round(T$estimate[1], digits=5) )
a <- table.row.end(a)
a <- table.row.start(a)
a <- table.element(a,'Mean2',1,TRUE)
a<-table.element(a,round(T$estimate[2], digits=5) )
a <- table.row.end(a)
}
a <- table.row.start(a)
a <- table.element(a,'T Statistic',1,TRUE)
a<-table.element(a,round(T$statistic, digits=5) )
a <- table.row.end(a)
a <- table.row.start(a)
a <- table.element(a,'P-value',1,TRUE)
a<-table.element(a,round(T$p.value, digits=5) )
a <- table.row.end(a)
a <- table.row.start(a)
a <- table.element(a,'Lower Confidence Limit',1,TRUE)
a<-table.element(a,round(T$conf.int[1], digits=5) )
a <- table.row.end(a)
a<-table.row.start(a)
a <- table.element(a,'Upper Confidence Limit',1,TRUE)
a<-table.element(a,round(T$conf.int[2], digits=5) )
a <- table.row.end(a)
a<-table.end(a)
table.save(a,file='mytable.tab')
}
a<-table.start()
a <- table.row.start(a)
a <- table.element(a,'Standard Deviations',3,TRUE)
a <- table.row.end(a)
a <- table.row.start(a)
a <- table.element(a,'Variable 1',1,TRUE)
a<-table.element(a,round(sd(x[,par2]), digits=5) )
a <- table.row.end(a)
a <- table.row.start(a)
a <- table.element(a,'Variable 2',1,TRUE)
a<-table.element(a,round(sd(x[,par3]), digits=5) )
a <- table.row.end(a)
a<-table.end(a)
table.save(a,file='mytable1.tab')

Free Statistics

Description of Statistical Computation

Tree of Dependent Computations

Dataset

Tables (Output of Computation)

Figures (Output of Computation)

Input Parameters & R Code