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Author*The author of this computation has been verified*
R Software Modulerwasp_twosampletests_mean.wasp
Title produced by softwarePaired and Unpaired Two Samples Tests about the Mean
Date of computationWed, 10 Dec 2014 13:12:30 +0000
Cite this page as followsStatistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?v=date/2014/Dec/10/t1418217726nyc2n4pcxjbypbw.htm/, Retrieved Sun, 19 May 2024 13:36:27 +0000
Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?pk=265130, Retrieved Sun, 19 May 2024 13:36:27 +0000
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Original text written by user:
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Estimated Impact67
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-       [Paired and Unpaired Two Samples Tests about the Mean] [] [2014-12-10 13:12:30] [4cfc068a520cd237806cfcade835365e] [Current]
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Dataseries X:
NA	10
NA	21
NA	17
NA	20
NA	13
NA	11
NA	9
NA	15
NA	10
NA	10
NA	17
NA	16
NA	13
NA	15
NA	19
NA	14
NA	16
NA	16
NA	11
NA	16
NA	13
NA	16
NA	16
NA	20
NA	19
NA	12
NA	9
NA	14
NA	17
NA	25
NA	12
NA	16
NA	19
NA	16
NA	11
NA	19
NA	15
NA	22
NA	19
NA	17
NA	18
NA	8
NA	12
NA	16
NA	18
NA	16
NA	20
NA	11
NA	13
NA	9
NA	15
NA	12
NA	23
NA	19
NA	9
NA	19
NA	8
NA	10
NA	15
NA	13
NA	18
NA	10
NA	20
NA	10
NA	16
NA	19
NA	15
NA	14
NA	11
NA	15
NA	24
NA	16
NA	13
NA	14
NA	14
NA	17
NA	20
NA	19
NA	14
NA	14
NA	22
NA	7
NA	22
NA	13
NA	14
NA	19
NA	18
6	NA
15	NA
4	NA
4	NA
6	NA
12	NA
12	NA
11	NA
11	NA
11	NA
8	NA
14	NA
13	NA
7	NA
17	NA
8	NA
9	NA
13	NA
7	NA
8	NA
15	NA
5	NA
14	NA
12	NA
10	NA
22	NA
18	NA
17	NA
14	NA
8	NA
17	NA
13	NA
14	NA
6	NA
18	NA
16	NA
18	NA
5	NA
17	NA
19	NA
6	NA
15	NA
16	NA
16	NA
15	NA
17	NA
11	NA
18	NA
14	NA
18	NA
20	NA
17	NA
10	NA
14	NA
18	NA
18	NA
13	NA
10	NA
12	NA
10	NA
13	NA
8	NA
9	NA
12	NA
11	NA
10	NA
16	NA
14	NA
19	NA
16	NA
21	NA
16	NA
12	NA
9	NA
15	NA
11	NA
20	NA
19	NA
11	NA
8	NA
19	NA
24	NA
10	NA
20	NA
17	NA
10	NA
15	NA
16	NA
16	NA
24	NA
17	NA
10	NA
12	NA
22	NA
7	NA
10	NA
18	NA
19	NA
12	NA
12	NA
12	NA
14	NA
4	NA
7	NA
11	NA
16	NA
11	NA
19	NA
12	NA
9	NA
16	NA
8	NA
11	NA
11	NA
6	NA
16	NA
16	NA
11	NA
17	NA
16	NA
15	NA
15	NA
15	NA
10	NA




Summary of computational transaction
Raw Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time1 seconds
R Server'Gwilym Jenkins' @ jenkins.wessa.net
R Framework error message
The field 'Names of X columns' contains a hard return which cannot be interpreted.
Please, resubmit your request without hard returns in the 'Names of X columns'.

\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' @ jenkins.wessa.net \tabularnewline
R Framework error message & 
The field 'Names of X columns' contains a hard return which cannot be interpreted.
Please, resubmit your request without hard returns in the 'Names of X columns'.
\tabularnewline \hline \end{tabular} %Source: https://freestatistics.org/blog/index.php?pk=265130&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' @ jenkins.wessa.net[/C][/ROW]
[ROW][C]R Framework error message[/C][C]
The field 'Names of X columns' contains a hard return which cannot be interpreted.
Please, resubmit your request without hard returns in the 'Names of X columns'.
[/C][/ROW] [/TABLE] Source: https://freestatistics.org/blog/index.php?pk=265130&T=0

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=265130&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 Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time1 seconds
R Server'Gwilym Jenkins' @ jenkins.wessa.net
R Framework error message
The field 'Names of X columns' contains a hard return which cannot be interpreted.
Please, resubmit your request without hard returns in the 'Names of X columns'.







Two Sample t-test (unpaired)
Mean of Sample 113.2258064516129
Mean of Sample 215.264367816092
t-stat-3.39155560048251
df209
p-value0.000831021906822589
H0 value0
Alternativetwo.sided
CI Level0.95
CI[-3.22349785924463,-0.853624869713465]
F-test to compare two variances
F-stat1.25268301681149
df123
p-value0.266895445911894
H0 value1
Alternativetwo.sided
CI Level0.95
CI[0.840753968718242,1.84094284539954]

\begin{tabular}{lllllllll}
\hline
Two Sample t-test (unpaired) \tabularnewline
Mean of Sample 1 & 13.2258064516129 \tabularnewline
Mean of Sample 2 & 15.264367816092 \tabularnewline
t-stat & -3.39155560048251 \tabularnewline
df & 209 \tabularnewline
p-value & 0.000831021906822589 \tabularnewline
H0 value & 0 \tabularnewline
Alternative & two.sided \tabularnewline
CI Level & 0.95 \tabularnewline
CI & [-3.22349785924463,-0.853624869713465] \tabularnewline
F-test to compare two variances \tabularnewline
F-stat & 1.25268301681149 \tabularnewline
df & 123 \tabularnewline
p-value & 0.266895445911894 \tabularnewline
H0 value & 1 \tabularnewline
Alternative & two.sided \tabularnewline
CI Level & 0.95 \tabularnewline
CI & [0.840753968718242,1.84094284539954] \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=265130&T=1

[TABLE]
[ROW][C]Two Sample t-test (unpaired)[/C][/ROW]
[ROW][C]Mean of Sample 1[/C][C]13.2258064516129[/C][/ROW]
[ROW][C]Mean of Sample 2[/C][C]15.264367816092[/C][/ROW]
[ROW][C]t-stat[/C][C]-3.39155560048251[/C][/ROW]
[ROW][C]df[/C][C]209[/C][/ROW]
[ROW][C]p-value[/C][C]0.000831021906822589[/C][/ROW]
[ROW][C]H0 value[/C][C]0[/C][/ROW]
[ROW][C]Alternative[/C][C]two.sided[/C][/ROW]
[ROW][C]CI Level[/C][C]0.95[/C][/ROW]
[ROW][C]CI[/C][C][-3.22349785924463,-0.853624869713465][/C][/ROW]
[ROW][C]F-test to compare two variances[/C][/ROW]
[ROW][C]F-stat[/C][C]1.25268301681149[/C][/ROW]
[ROW][C]df[/C][C]123[/C][/ROW]
[ROW][C]p-value[/C][C]0.266895445911894[/C][/ROW]
[ROW][C]H0 value[/C][C]1[/C][/ROW]
[ROW][C]Alternative[/C][C]two.sided[/C][/ROW]
[ROW][C]CI Level[/C][C]0.95[/C][/ROW]
[ROW][C]CI[/C][C][0.840753968718242,1.84094284539954][/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=265130&T=1

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=265130&T=1

As an alternative you can also use a QR Code:  

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

Two Sample t-test (unpaired)
Mean of Sample 113.2258064516129
Mean of Sample 215.264367816092
t-stat-3.39155560048251
df209
p-value0.000831021906822589
H0 value0
Alternativetwo.sided
CI Level0.95
CI[-3.22349785924463,-0.853624869713465]
F-test to compare two variances
F-stat1.25268301681149
df123
p-value0.266895445911894
H0 value1
Alternativetwo.sided
CI Level0.95
CI[0.840753968718242,1.84094284539954]







Welch Two Sample t-test (unpaired)
Mean of Sample 113.2258064516129
Mean of Sample 215.264367816092
t-stat-3.4592545168833
df197.132108394628
p-value0.00066378026918317
H0 value0
Alternativetwo.sided
CI Level0.95
CI[-3.20071565385452,-0.876407075103581]

\begin{tabular}{lllllllll}
\hline
Welch Two Sample t-test (unpaired) \tabularnewline
Mean of Sample 1 & 13.2258064516129 \tabularnewline
Mean of Sample 2 & 15.264367816092 \tabularnewline
t-stat & -3.4592545168833 \tabularnewline
df & 197.132108394628 \tabularnewline
p-value & 0.00066378026918317 \tabularnewline
H0 value & 0 \tabularnewline
Alternative & two.sided \tabularnewline
CI Level & 0.95 \tabularnewline
CI & [-3.20071565385452,-0.876407075103581] \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=265130&T=2

[TABLE]
[ROW][C]Welch Two Sample t-test (unpaired)[/C][/ROW]
[ROW][C]Mean of Sample 1[/C][C]13.2258064516129[/C][/ROW]
[ROW][C]Mean of Sample 2[/C][C]15.264367816092[/C][/ROW]
[ROW][C]t-stat[/C][C]-3.4592545168833[/C][/ROW]
[ROW][C]df[/C][C]197.132108394628[/C][/ROW]
[ROW][C]p-value[/C][C]0.00066378026918317[/C][/ROW]
[ROW][C]H0 value[/C][C]0[/C][/ROW]
[ROW][C]Alternative[/C][C]two.sided[/C][/ROW]
[ROW][C]CI Level[/C][C]0.95[/C][/ROW]
[ROW][C]CI[/C][C][-3.20071565385452,-0.876407075103581][/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=265130&T=2

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=265130&T=2

As an alternative you can also use a QR Code:  

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

Welch Two Sample t-test (unpaired)
Mean of Sample 113.2258064516129
Mean of Sample 215.264367816092
t-stat-3.4592545168833
df197.132108394628
p-value0.00066378026918317
H0 value0
Alternativetwo.sided
CI Level0.95
CI[-3.20071565385452,-0.876407075103581]







Wicoxon rank sum test with continuity correction (unpaired)
W4047.5
p-value0.00199378492237239
H0 value0
Alternativetwo.sided
Kolmogorov-Smirnov Test to compare Distributions of two Samples
KS Statistic0.21486837226548
p-value0.0178126265815554
Kolmogorov-Smirnov Test to compare Distributional Shape of two Samples
KS Statistic0.135613644790508
p-value0.303936352837173

\begin{tabular}{lllllllll}
\hline
Wicoxon rank sum test with continuity correction (unpaired) \tabularnewline
W & 4047.5 \tabularnewline
p-value & 0.00199378492237239 \tabularnewline
H0 value & 0 \tabularnewline
Alternative & two.sided \tabularnewline
Kolmogorov-Smirnov Test to compare Distributions of two Samples \tabularnewline
KS Statistic & 0.21486837226548 \tabularnewline
p-value & 0.0178126265815554 \tabularnewline
Kolmogorov-Smirnov Test to compare Distributional Shape of two Samples \tabularnewline
KS Statistic & 0.135613644790508 \tabularnewline
p-value & 0.303936352837173 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=265130&T=3

[TABLE]
[ROW][C]Wicoxon rank sum test with continuity correction (unpaired)[/C][/ROW]
[ROW][C]W[/C][C]4047.5[/C][/ROW]
[ROW][C]p-value[/C][C]0.00199378492237239[/C][/ROW]
[ROW][C]H0 value[/C][C]0[/C][/ROW]
[ROW][C]Alternative[/C][C]two.sided[/C][/ROW]
[ROW][C]Kolmogorov-Smirnov Test to compare Distributions of two Samples[/C][/ROW]
[ROW][C]KS Statistic[/C][C]0.21486837226548[/C][/ROW]
[ROW][C]p-value[/C][C]0.0178126265815554[/C][/ROW]
[ROW][C]Kolmogorov-Smirnov Test to compare Distributional Shape of two Samples[/C][/ROW]
[ROW][C]KS Statistic[/C][C]0.135613644790508[/C][/ROW]
[ROW][C]p-value[/C][C]0.303936352837173[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=265130&T=3

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=265130&T=3

As an alternative you can also use a QR Code:  

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

Wicoxon rank sum test with continuity correction (unpaired)
W4047.5
p-value0.00199378492237239
H0 value0
Alternativetwo.sided
Kolmogorov-Smirnov Test to compare Distributions of two Samples
KS Statistic0.21486837226548
p-value0.0178126265815554
Kolmogorov-Smirnov Test to compare Distributional Shape of two Samples
KS Statistic0.135613644790508
p-value0.303936352837173



Parameters (Session):
par1 = 1 ; par2 = 2 ; par3 = 0.95 ; par4 = two.sided ; par5 = unpaired ; par6 = 0.0 ;
Parameters (R input):
par1 = 1 ; par2 = 2 ; par3 = 0.95 ; par4 = two.sided ; par5 = unpaired ; par6 = 0.0 ;
R code (references can be found in the software module):
par1 <- as.numeric(par1) #column number of first sample
par2 <- as.numeric(par2) #column number of second sample
par3 <- as.numeric(par3) #confidence (= 1 - alpha)
if (par5 == 'unpaired') paired <- FALSE else paired <- TRUE
par6 <- as.numeric(par6) #H0
z <- t(y)
if (par1 == par2) stop('Please, select two different column numbers')
if (par1 < 1) stop('Please, select a column number greater than zero for the first sample')
if (par2 < 1) stop('Please, select a column number greater than zero for the second sample')
if (par1 > length(z[1,])) stop('The column number for the first sample should be smaller')
if (par2 > length(z[1,])) stop('The column number for the second sample should be smaller')
if (par3 <= 0) stop('The confidence level should be larger than zero')
if (par3 >= 1) stop('The confidence level should be smaller than zero')
(r.t <- t.test(z[,par1],z[,par2],var.equal=TRUE,alternative=par4,paired=paired,mu=par6,conf.level=par3))
(v.t <- var.test(z[,par1],z[,par2],conf.level=par3))
(r.w <- t.test(z[,par1],z[,par2],var.equal=FALSE,alternative=par4,paired=paired,mu=par6,conf.level=par3))
(w.t <- wilcox.test(z[,par1],z[,par2],alternative=par4,paired=paired,mu=par6,conf.level=par3))
(ks.t <- ks.test(z[,par1],z[,par2],alternative=par4))
m1 <- mean(z[,par1],na.rm=T)
m2 <- mean(z[,par2],na.rm=T)
mdiff <- m1 - m2
newsam1 <- z[!is.na(z[,par1]),par1]
newsam2 <- z[,par2]+mdiff
newsam2 <- newsam2[!is.na(newsam2)]
(ks1.t <- ks.test(newsam1,newsam2,alternative=par4))
mydf <- data.frame(cbind(z[,par1],z[,par2]))
colnames(mydf) <- c('Variable 1','Variable 2')
bitmap(file='test1.png')
boxplot(mydf, notch=TRUE, ylab='value',main=main)
dev.off()
bitmap(file='test2.png')
qqnorm(z[,par1],main='Normal QQplot - Variable 1')
qqline(z[,par1])
dev.off()
bitmap(file='test3.png')
qqnorm(z[,par2],main='Normal QQplot - Variable 2')
qqline(z[,par2])
dev.off()
load(file='createtable')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a,paste('Two Sample t-test (',par5,')',sep=''),2,TRUE)
a<-table.row.end(a)
if(!paired){
a<-table.row.start(a)
a<-table.element(a,'Mean of Sample 1',header=TRUE)
a<-table.element(a,r.t$estimate[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Mean of Sample 2',header=TRUE)
a<-table.element(a,r.t$estimate[[2]])
a<-table.row.end(a)
} else {
a<-table.row.start(a)
a<-table.element(a,'Difference: Mean1 - Mean2',header=TRUE)
a<-table.element(a,r.t$estimate)
a<-table.row.end(a)
}
a<-table.row.start(a)
a<-table.element(a,'t-stat',header=TRUE)
a<-table.element(a,r.t$statistic[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'df',header=TRUE)
a<-table.element(a,r.t$parameter[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'p-value',header=TRUE)
a<-table.element(a,r.t$p.value)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'H0 value',header=TRUE)
a<-table.element(a,r.t$null.value[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Alternative',header=TRUE)
a<-table.element(a,r.t$alternative)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'CI Level',header=TRUE)
a<-table.element(a,attr(r.t$conf.int,'conf.level'))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'CI',header=TRUE)
a<-table.element(a,paste('[',r.t$conf.int[1],',',r.t$conf.int[2],']',sep=''))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'F-test to compare two variances',2,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'F-stat',header=TRUE)
a<-table.element(a,v.t$statistic[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'df',header=TRUE)
a<-table.element(a,v.t$parameter[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'p-value',header=TRUE)
a<-table.element(a,v.t$p.value)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'H0 value',header=TRUE)
a<-table.element(a,v.t$null.value[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Alternative',header=TRUE)
a<-table.element(a,v.t$alternative)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'CI Level',header=TRUE)
a<-table.element(a,attr(v.t$conf.int,'conf.level'))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'CI',header=TRUE)
a<-table.element(a,paste('[',v.t$conf.int[1],',',v.t$conf.int[2],']',sep=''))
a<-table.row.end(a)
a<-table.end(a)
table.save(a,file='mytable.tab')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a,paste('Welch Two Sample t-test (',par5,')',sep=''),2,TRUE)
a<-table.row.end(a)
if(!paired){
a<-table.row.start(a)
a<-table.element(a,'Mean of Sample 1',header=TRUE)
a<-table.element(a,r.w$estimate[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Mean of Sample 2',header=TRUE)
a<-table.element(a,r.w$estimate[[2]])
a<-table.row.end(a)
} else {
a<-table.row.start(a)
a<-table.element(a,'Difference: Mean1 - Mean2',header=TRUE)
a<-table.element(a,r.w$estimate)
a<-table.row.end(a)
}
a<-table.row.start(a)
a<-table.element(a,'t-stat',header=TRUE)
a<-table.element(a,r.w$statistic[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'df',header=TRUE)
a<-table.element(a,r.w$parameter[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'p-value',header=TRUE)
a<-table.element(a,r.w$p.value)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'H0 value',header=TRUE)
a<-table.element(a,r.w$null.value[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Alternative',header=TRUE)
a<-table.element(a,r.w$alternative)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'CI Level',header=TRUE)
a<-table.element(a,attr(r.w$conf.int,'conf.level'))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'CI',header=TRUE)
a<-table.element(a,paste('[',r.w$conf.int[1],',',r.w$conf.int[2],']',sep=''))
a<-table.row.end(a)
a<-table.end(a)
table.save(a,file='mytable1.tab')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a,paste('Wicoxon rank sum test with continuity correction (',par5,')',sep=''),2,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'W',header=TRUE)
a<-table.element(a,w.t$statistic[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'p-value',header=TRUE)
a<-table.element(a,w.t$p.value)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'H0 value',header=TRUE)
a<-table.element(a,w.t$null.value[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Alternative',header=TRUE)
a<-table.element(a,w.t$alternative)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Kolmogorov-Smirnov Test to compare Distributions of two Samples',2,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'KS Statistic',header=TRUE)
a<-table.element(a,ks.t$statistic[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'p-value',header=TRUE)
a<-table.element(a,ks.t$p.value)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Kolmogorov-Smirnov Test to compare Distributional Shape of two Samples',2,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'KS Statistic',header=TRUE)
a<-table.element(a,ks1.t$statistic[[1]])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'p-value',header=TRUE)
a<-table.element(a,ks1.t$p.value)
a<-table.row.end(a)
a<-table.end(a)
table.save(a,file='mytable2.tab')