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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 computationSat, 13 Dec 2014 13:02:38 +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/13/t1418475955ofzda3qxcan726w.htm/, Retrieved Sun, 19 May 2024 15:37:35 +0000
Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?pk=267060, Retrieved Sun, 19 May 2024 15:37:35 +0000
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-       [Paired and Unpaired Two Samples Tests about the Mean] [twosampex] [2014-12-13 13:02:38] [ba449e08135e498de67ac1fe8477f1b8] [Current]
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Dataseries X:
NA 50
62 NA
NA 54
71 NA
54 NA
65 NA
NA 73
52 NA
84 NA
42 NA
66 NA
65 NA
78 NA
NA 73
NA 75
NA 72
66 NA
NA 70
61 NA
NA 81
71 NA
69 NA
NA 71
72 NA
68 NA
70 NA
68 NA
NA 61
67 NA
NA 76
NA 70
NA 60
72 NA
69 NA
71 NA
62 NA
NA 70
64 NA
58 NA
NA 76
52 NA
59 NA
68 NA
76 NA
65 NA
NA 67
59 NA
69 NA
NA 76
63 NA
75 NA
63 NA
60 NA
73 NA
63 NA
70 NA
NA 75
66 NA
NA 63
63 NA
64 NA
NA 70
NA 75
61 NA
NA 60
62 NA
NA 73
61 NA
66 NA
NA 64
NA 59
NA 64
NA 60
56 NA
NA 78
NA 67
59 NA
NA 66
NA 68
71 NA
NA 66
NA 73
NA 72
71 NA
NA 59
64 NA
66 NA
NA 78
NA 68
NA 73
62 NA
65 NA
68 NA
NA 65
60 NA
NA 71
65 NA
68 NA
64 NA
74 NA
69 NA
NA 76
68 NA
72 NA
67 NA
NA 63
NA 59
NA 73
NA 66
NA 62
NA 69
66 NA
51 NA
56 NA
67 NA
69 NA
NA 57
56 NA
55 NA
NA 63
67 NA
NA 65
NA 47
76 NA
64 NA
68 NA
64 NA
65 NA
71 NA
63 NA
60 NA
NA 68
72 NA
70 NA
61 NA
61 NA
62 NA
71 NA
NA 71
51 NA
56 NA
70 NA
73 NA
76 NA
NA 68
NA 48
52 NA
NA 60
NA 59
57 NA
NA 79
60 NA
60 NA
NA 59
62 NA
59 NA
61 NA
NA 71
NA 57
NA 66
NA 63
69 NA
NA 58
59 NA
NA 48
66 NA
NA 73
67 NA
NA 61
NA 68
75 NA
NA 62
69 NA
58 NA
60 NA
74 NA
55 NA
NA 62
63 NA
NA 69
NA 58
NA 58
68 NA
NA 72
62 NA
NA 62
NA 65
NA 69
NA 66
72 NA
62 NA
75 NA
58 NA
NA 66
NA 55
47 NA
NA 72
NA 62
NA 64
NA 64
19 NA
50 NA
NA 68
NA 70
79 NA
NA 69
71 NA
48 NA
NA 73
74 NA
66 NA
71 NA
NA 74
NA 78
NA 75
53 NA
60 NA
70 NA
69 NA
NA 65
NA 78
NA 78
59 NA
72 NA
NA 70
NA 63
NA 63
71 NA
74 NA
NA 67
NA 66
NA 62
80 NA
73 NA
67 NA
61 NA
NA 73
74 NA
32 NA
69 NA
NA 69
NA 84
64 NA
NA 58
59 NA
78 NA
NA 57
60 NA
NA 68
68 NA
73 NA
NA 69
67 NA
NA 60
65 NA
NA 66
74 NA
NA 81
NA 72
55 NA
49 NA
NA 74
53 NA
64 NA
NA 65
57 NA
NA 51
NA 80
67 NA
70 NA
NA 74
75 NA
NA 70
NA 69
65 NA
NA 55
NA 71




Summary of computational transaction
Raw Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time2 seconds
R Server'Gertrude Mary Cox' @ cox.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 & 2 seconds \tabularnewline
R Server & 'Gertrude Mary Cox' @ cox.wessa.net \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=267060&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]2 seconds[/C][/ROW]
[ROW][C]R Server[/C][C]'Gertrude Mary Cox' @ cox.wessa.net[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=267060&T=0

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=267060&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 time2 seconds
R Server'Gertrude Mary Cox' @ cox.wessa.net







Two Sample t-test (unpaired)
Mean of Sample 164.5222929936306
Mean of Sample 266.9166666666667
t-stat-2.44018085717488
df275
p-value0.0153116370161721
H0 value0
Alternativetwo.sided
CI Level0.95
CI[-4.32604637348486,-0.462700972587344]
F-test to compare two variances
F-stat1.30379385179357
df156
p-value0.128662680667201
H0 value1
Alternativetwo.sided
CI Level0.95
CI[0.925484125905521,1.82244102540864]

\begin{tabular}{lllllllll}
\hline
Two Sample t-test (unpaired) \tabularnewline
Mean of Sample 1 & 64.5222929936306 \tabularnewline
Mean of Sample 2 & 66.9166666666667 \tabularnewline
t-stat & -2.44018085717488 \tabularnewline
df & 275 \tabularnewline
p-value & 0.0153116370161721 \tabularnewline
H0 value & 0 \tabularnewline
Alternative & two.sided \tabularnewline
CI Level & 0.95 \tabularnewline
CI & [-4.32604637348486,-0.462700972587344] \tabularnewline
F-test to compare two variances \tabularnewline
F-stat & 1.30379385179357 \tabularnewline
df & 156 \tabularnewline
p-value & 0.128662680667201 \tabularnewline
H0 value & 1 \tabularnewline
Alternative & two.sided \tabularnewline
CI Level & 0.95 \tabularnewline
CI & [0.925484125905521,1.82244102540864] \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=267060&T=1

[TABLE]
[ROW][C]Two Sample t-test (unpaired)[/C][/ROW]
[ROW][C]Mean of Sample 1[/C][C]64.5222929936306[/C][/ROW]
[ROW][C]Mean of Sample 2[/C][C]66.9166666666667[/C][/ROW]
[ROW][C]t-stat[/C][C]-2.44018085717488[/C][/ROW]
[ROW][C]df[/C][C]275[/C][/ROW]
[ROW][C]p-value[/C][C]0.0153116370161721[/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][-4.32604637348486,-0.462700972587344][/C][/ROW]
[ROW][C]F-test to compare two variances[/C][/ROW]
[ROW][C]F-stat[/C][C]1.30379385179357[/C][/ROW]
[ROW][C]df[/C][C]156[/C][/ROW]
[ROW][C]p-value[/C][C]0.128662680667201[/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][0.925484125905521,1.82244102540864][/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=267060&T=1

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=267060&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 164.5222929936306
Mean of Sample 266.9166666666667
t-stat-2.44018085717488
df275
p-value0.0153116370161721
H0 value0
Alternativetwo.sided
CI Level0.95
CI[-4.32604637348486,-0.462700972587344]
F-test to compare two variances
F-stat1.30379385179357
df156
p-value0.128662680667201
H0 value1
Alternativetwo.sided
CI Level0.95
CI[0.925484125905521,1.82244102540864]







Welch Two Sample t-test (unpaired)
Mean of Sample 164.5222929936306
Mean of Sample 266.9166666666667
t-stat-2.48370374392854
df269.89478966905
p-value0.0136097283930879
H0 value0
Alternativetwo.sided
CI Level0.95
CI[-4.29235562302665,-0.496391723045553]

\begin{tabular}{lllllllll}
\hline
Welch Two Sample t-test (unpaired) \tabularnewline
Mean of Sample 1 & 64.5222929936306 \tabularnewline
Mean of Sample 2 & 66.9166666666667 \tabularnewline
t-stat & -2.48370374392854 \tabularnewline
df & 269.89478966905 \tabularnewline
p-value & 0.0136097283930879 \tabularnewline
H0 value & 0 \tabularnewline
Alternative & two.sided \tabularnewline
CI Level & 0.95 \tabularnewline
CI & [-4.29235562302665,-0.496391723045553] \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=267060&T=2

[TABLE]
[ROW][C]Welch Two Sample t-test (unpaired)[/C][/ROW]
[ROW][C]Mean of Sample 1[/C][C]64.5222929936306[/C][/ROW]
[ROW][C]Mean of Sample 2[/C][C]66.9166666666667[/C][/ROW]
[ROW][C]t-stat[/C][C]-2.48370374392854[/C][/ROW]
[ROW][C]df[/C][C]269.89478966905[/C][/ROW]
[ROW][C]p-value[/C][C]0.0136097283930879[/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][-4.29235562302665,-0.496391723045553][/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=267060&T=2

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=267060&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 164.5222929936306
Mean of Sample 266.9166666666667
t-stat-2.48370374392854
df269.89478966905
p-value0.0136097283930879
H0 value0
Alternativetwo.sided
CI Level0.95
CI[-4.29235562302665,-0.496391723045553]







Wicoxon rank sum test with continuity correction (unpaired)
W7962.5
p-value0.0272871220496861
H0 value0
Alternativetwo.sided
Kolmogorov-Smirnov Test to compare Distributions of two Samples
KS Statistic0.113428874734607
p-value0.345677398799383
Kolmogorov-Smirnov Test to compare Distributional Shape of two Samples
KS Statistic0.0670382165605095
p-value0.919905320792851

\begin{tabular}{lllllllll}
\hline
Wicoxon rank sum test with continuity correction (unpaired) \tabularnewline
W & 7962.5 \tabularnewline
p-value & 0.0272871220496861 \tabularnewline
H0 value & 0 \tabularnewline
Alternative & two.sided \tabularnewline
Kolmogorov-Smirnov Test to compare Distributions of two Samples \tabularnewline
KS Statistic & 0.113428874734607 \tabularnewline
p-value & 0.345677398799383 \tabularnewline
Kolmogorov-Smirnov Test to compare Distributional Shape of two Samples \tabularnewline
KS Statistic & 0.0670382165605095 \tabularnewline
p-value & 0.919905320792851 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=267060&T=3

[TABLE]
[ROW][C]Wicoxon rank sum test with continuity correction (unpaired)[/C][/ROW]
[ROW][C]W[/C][C]7962.5[/C][/ROW]
[ROW][C]p-value[/C][C]0.0272871220496861[/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]0.113428874734607[/C][/ROW]
[ROW][C]p-value[/C][C]0.345677398799383[/C][/ROW]
[ROW][C]Kolmogorov-Smirnov Test to compare Distributional Shape of two Samples[/C][/ROW]
[ROW][C]KS Statistic[/C][C]0.0670382165605095[/C][/ROW]
[ROW][C]p-value[/C][C]0.919905320792851[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=267060&T=3

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=267060&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)
W7962.5
p-value0.0272871220496861
H0 value0
Alternativetwo.sided
Kolmogorov-Smirnov Test to compare Distributions of two Samples
KS Statistic0.113428874734607
p-value0.345677398799383
Kolmogorov-Smirnov Test to compare Distributional Shape of two Samples
KS Statistic0.0670382165605095
p-value0.919905320792851



Parameters (Session):
Parameters (R input):
par1 = 1 ; par2 = 2 ; par3 = 0.95 ; par4 = two.sided ; par5 = unpaired ; par6 = 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')