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Workshop 7

*The author of this computation has been verified*
R Software Module: /rwasp_multipleregression.wasp (opens new window with default values)
Title produced by software: Multiple Regression
Date of computation: Sat, 21 Nov 2009 06:42:15 -0700
 
Cite this page as follows:
Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e.htm/, Retrieved Sat, 21 Nov 2009 14:43:22 +0100
 
BibTeX entries for LaTeX users:
@Manual{KEY,
    author = {{YOUR NAME}},
    publisher = {Office for Research Development and Education},
    title = {Statistical Computations at FreeStatistics.org, URL http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e.htm/},
    year = {2009},
}
@Manual{R,
    title = {R: A Language and Environment for Statistical Computing},
    author = {{R Development Core Team}},
    organization = {R Foundation for Statistical Computing},
    address = {Vienna, Austria},
    year = {2009},
    note = {{ISBN} 3-900051-07-0},
    url = {http://www.R-project.org},
}
 
Original text written by user:
 
IsPrivate?
No (this computation is public)
 
User-defined keywords:
WS 7 part 2
 
Dataseries X:
» Textbox « » Textfile « » CSV «
9.3 98.3 9.3 112.3 8.7 113.9 8.2 106.2 8.3 98.6 8.5 96.5 8.6 95.9 8.5 103.7 8.2 103.1 8.1 103.7 7.9 112.1 8.6 86.9 8.7 95 8.7 111.8 8.5 108.8 8.4 109.3 8.5 101.4 8.7 100.5 8.7 100.7 8.6 113.5 8.5 106.1 8.3 111.6 8 114.9 8.2 88.6 8.1 99.5 8.1 115.1 8 118 7.9 111.4 7.9 107.3 8 105.3 8 105.3 7.9 117.9 8 110.2 7.7 112.4 7.2 117.5 7.5 93 7.3 103.5 7 116.3 7 120 7 114.3 7.2 104.7 7.3 109.8 7.1 112.6 6.8 114.4 6.4 115.7 6.1 114.7 6.5 118.4 7.7 94.9 7.9 103.8 7.5 115.1 6.9 113.7 6.6 104 6.9 94.3 7.7 92.5 8 93.2 8 104.7 7.7 94 7.3 98.1 7.4 102.7 8.1 82.4
 
Output produced by software:

Enter (or paste) a matrix (table) containing all data (time) series. Every column represents a different variable and must be delimited by a space or Tab. Every row represents a period in time (or category) and must be delimited by hard returns. The easiest way to enter data is to copy and paste a block of spreadsheet cells. Please, do not use commas or spaces to seperate groups of digits!


Summary of computational transaction
Raw Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time3 seconds
R Server'Gwilym Jenkins' @ 72.249.127.135


Multiple Linear Regression - Estimated Regression Equation
Y[t] = + 12.1462142797098 -0.0462787604274321X[t] + 0.742587338241901M1[t] + 1.25511786026870M2[t] + 0.990289718193554M3[t] + 0.520021757297351M4[t] + 0.299973001171929M5[t] + 0.564238222626601M6[t] + 0.63293105409161M7[t] + 0.943323526066729M8[t] + 0.511004148721019M9[t] + 0.356519722495564M10[t] + 0.488839099841274M11[t] + e[t]


Multiple Linear Regression - Ordinary Least Squares
VariableParameterS.D.T-STAT
H0: parameter = 0
2-tail p-value1-tail p-value
(Intercept)12.14621427970981.557477.798700
X-0.04627876042743210.017123-2.70270.0095410.004771
M10.7425873382419010.473631.56790.1236220.061811
M21.255117860268700.6102562.05670.0452890.022645
M30.9902897181935540.619441.59870.1165920.058296
M40.5200217572973510.5528330.94060.3516940.175847
M50.2999730011719290.4823620.62190.5370240.268512
M60.5642382226266010.479891.17580.245610.122805
M70.632931054091610.4844411.30650.1977340.098867
M80.9433235260667290.5723271.64820.1059760.052988
M90.5110041487210190.5206970.98140.3314280.165714
M100.3565197224955640.543070.65650.5147110.257355
M110.4888390998412740.5983880.81690.4180920.209046


Multiple Linear Regression - Regression Statistics
Multiple R0.496313832173041
R-squared0.24632742000629
Adjusted R-squared0.0539003783057682
F-TEST (value)1.28010812736837
F-TEST (DF numerator)12
F-TEST (DF denominator)47
p-value0.261695716134239
Multiple Linear Regression - Residual Statistics
Residual Standard Deviation0.68873946915187
Sum Squared Residuals22.2950166492772


Multiple Linear Regression - Actuals, Interpolation, and Residuals
Time or IndexActualsInterpolation
Forecast
Residuals
Prediction Error
19.38.339599467935230.960400532064768
29.38.204227343977931.09577265602207
38.77.865353185218880.834646814781115
48.27.75143167961390.448568320386093
58.37.883101502736970.416898497263031
68.58.244552121089250.25544787891075
78.68.341012208810720.258987791189283
88.58.290430349451870.209569650548135
98.27.885878228362620.314121771637384
108.17.70362654588070.396373454119299
117.97.447204335635980.452795664364019
128.68.1245899985660.475410001434004
138.78.49231937734570.207680622654303
148.78.227366724191640.472633275808357
158.58.101374863398790.398625136601213
168.47.607967522288870.792032477711132
178.57.753520973540160.74647902645984
188.78.059437079379520.640562920620478
198.78.118874158759040.581125841240957
208.67.836898497263030.763101502736969
218.57.747041947080320.752958052919681
228.37.338024338503990.961975661496013
2387.317623806439170.682376193560829
248.28.045916105839360.154083894160637
258.18.28406495542225-0.184064955422253
268.18.074646814781120.0253531852188832
2787.675610267466410.324389732533588
287.97.510782125391260.38921787460874
297.97.480476287018310.419523712981690
3087.837299029327850.162700970672153
3187.905991860792850.0940081392071448
327.97.633271951382330.266728048617671
3387.557299029327850.442700970672153
347.77.301001330162040.398998669837959
357.27.197299029327850.00270097067215272
367.57.84228955995866-0.342289559958661
377.38.09894991371252-0.798949913712524
3878.0191123022682-1.01911230226820
3977.58305274661155-0.583052746611547
4077.37657372015171-0.376573720151707
417.27.60080106412963-0.400801064129633
427.37.6290446074044-0.329044607404403
437.17.5681569096726-0.468156909672601
446.87.79524761287834-0.995247612878342
456.47.30276584697697-0.90276584697697
466.17.19456018117895-1.09456018117895
476.57.15564814494316-0.655648144943159
487.77.75435991514654-0.054359915146539
497.98.0850662855843-0.185066285584294
507.58.07464681478112-0.574646814781117
516.97.87460893730437-0.97460893730437
526.67.85324495255426-1.25324495255426
536.98.08210017257493-1.18210017257493
547.78.42966716279898-0.729667162798978
5588.46596486196478-0.465964861964783
5688.24415158902443-0.244151589024433
577.78.30701494825225-0.607014948252247
587.37.96278760427432-0.662787604274321
597.47.88222468365384-0.482224683653842
608.18.33284442048944-0.232844420489441


Goldfeld-Quandt test for Heteroskedasticity
p-valuesAlternative Hypothesis
breakpoint indexgreater2-sidedless
160.08744041911205980.1748808382241200.91255958088794
170.03268684774918200.06537369549836390.967313152250818
180.01199408711200980.02398817422401960.98800591288799
190.005239877592589850.01047975518517970.99476012240741
200.003645347079042280.007290694158084550.996354652920958
210.001838001379686090.003676002759372180.998161998620314
220.001039448919318840.002078897838637690.998960551080681
230.0004803609903442150.000960721980688430.999519639009656
240.0005339893050062990.001067978610012600.999466010694994
250.01115780306856980.02231560613713950.98884219693143
260.04176692729584610.08353385459169230.958233072704154
270.05986559823008740.1197311964601750.940134401769913
280.07423421160639680.1484684232127940.925765788393603
290.09244252170944470.1848850434188890.907557478290555
300.0872233291688260.1744466583376520.912776670831174
310.07708764446873860.1541752889374770.922912355531261
320.07649940989450290.1529988197890060.923500590105497
330.1290950299803920.2581900599607840.870904970019608
340.3332933599656310.6665867199312610.66670664003437
350.3859723519175480.7719447038350960.614027648082452
360.3685619446846450.737123889369290.631438055315355
370.5386920662872640.9226158674254720.461307933712736
380.7205500360794320.5588999278411360.279449963920568
390.708978411896670.5820431762066610.291021588103331
400.8181588165677770.3636823668644460.181841183432223
410.9158554565546550.1682890868906890.0841445434453446
420.9292040742574570.1415918514850870.0707959257425433
430.8797713144392040.2404573711215910.120228685560796
440.9562144881062740.08757102378745240.0437855118937262


Meta Analysis of Goldfeld-Quandt test for Heteroskedasticity
Description# significant tests% significant testsOK/NOK
1% type I error level50.172413793103448NOK
5% type I error level80.275862068965517NOK
10% type I error level110.379310344827586NOK
 
Charts produced by software:
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/102v6o1258810930.png (open in new window)
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/102v6o1258810930.ps (open in new window)


http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/169gc1258810930.png (open in new window)
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/169gc1258810930.ps (open in new window)


http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/2dw471258810930.png (open in new window)
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/2dw471258810930.ps (open in new window)


http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/3tmfs1258810930.png (open in new window)
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/3tmfs1258810930.ps (open in new window)


http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/4mt1o1258810930.png (open in new window)
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/4mt1o1258810930.ps (open in new window)


http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/5bnmc1258810930.png (open in new window)
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/5bnmc1258810930.ps (open in new window)


http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/6t6go1258810930.png (open in new window)
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/6t6go1258810930.ps (open in new window)


http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/7zjj21258810930.png (open in new window)
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/7zjj21258810930.ps (open in new window)


http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/8h9s81258810930.png (open in new window)
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/8h9s81258810930.ps (open in new window)


http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/9xsyc1258810930.png (open in new window)
http://www.freestatistics.org/blog/date/2009/Nov/21/t1258810989bneo1scsea3416e/9xsyc1258810930.ps (open in new window)


 
Parameters (Session):
par1 = 1 ; par2 = Include Monthly Dummies ; par3 = No Linear Trend ;
 
Parameters (R input):
par1 = 1 ; par2 = Include Monthly Dummies ; par3 = No Linear Trend ;
 
R code (references can be found in the software module):
library(lattice)
library(lmtest)
n25 <- 25 #minimum number of obs. for Goldfeld-Quandt test
par1 <- as.numeric(par1)
x <- t(y)
k <- length(x[1,])
n <- length(x[,1])
x1 <- cbind(x[,par1], x[,1:k!=par1])
mycolnames <- c(colnames(x)[par1], colnames(x)[1:k!=par1])
colnames(x1) <- mycolnames #colnames(x)[par1]
x <- x1
if (par3 == 'First Differences'){
x2 <- array(0, dim=c(n-1,k), dimnames=list(1:(n-1), paste('(1-B)',colnames(x),sep='')))
for (i in 1:n-1) {
for (j in 1:k) {
x2[i,j] <- x[i+1,j] - x[i,j]
}
}
x <- x2
}
if (par2 == 'Include Monthly Dummies'){
x2 <- array(0, dim=c(n,11), dimnames=list(1:n, paste('M', seq(1:11), sep ='')))
for (i in 1:11){
x2[seq(i,n,12),i] <- 1
}
x <- cbind(x, x2)
}
if (par2 == 'Include Quarterly Dummies'){
x2 <- array(0, dim=c(n,3), dimnames=list(1:n, paste('Q', seq(1:3), sep ='')))
for (i in 1:3){
x2[seq(i,n,4),i] <- 1
}
x <- cbind(x, x2)
}
k <- length(x[1,])
if (par3 == 'Linear Trend'){
x <- cbind(x, c(1:n))
colnames(x)[k+1] <- 't'
}
x
k <- length(x[1,])
df <- as.data.frame(x)
(mylm <- lm(df))
(mysum <- summary(mylm))
if (n > n25) {
kp3 <- k + 3
nmkm3 <- n - k - 3
gqarr <- array(NA, dim=c(nmkm3-kp3+1,3))
numgqtests <- 0
numsignificant1 <- 0
numsignificant5 <- 0
numsignificant10 <- 0
for (mypoint in kp3:nmkm3) {
j <- 0
numgqtests <- numgqtests + 1
for (myalt in c('greater', 'two.sided', 'less')) {
j <- j + 1
gqarr[mypoint-kp3+1,j] <- gqtest(mylm, point=mypoint, alternative=myalt)$p.value
}
if (gqarr[mypoint-kp3+1,2] < 0.01) numsignificant1 <- numsignificant1 + 1
if (gqarr[mypoint-kp3+1,2] < 0.05) numsignificant5 <- numsignificant5 + 1
if (gqarr[mypoint-kp3+1,2] < 0.10) numsignificant10 <- numsignificant10 + 1
}
gqarr
}
bitmap(file='test0.png')
plot(x[,1], type='l', main='Actuals and Interpolation', ylab='value of Actuals and Interpolation (dots)', xlab='time or index')
points(x[,1]-mysum$resid)
grid()
dev.off()
bitmap(file='test1.png')
plot(mysum$resid, type='b', pch=19, main='Residuals', ylab='value of Residuals', xlab='time or index')
grid()
dev.off()
bitmap(file='test2.png')
hist(mysum$resid, main='Residual Histogram', xlab='values of Residuals')
grid()
dev.off()
bitmap(file='test3.png')
densityplot(~mysum$resid,col='black',main='Residual Density Plot', xlab='values of Residuals')
dev.off()
bitmap(file='test4.png')
qqnorm(mysum$resid, main='Residual Normal Q-Q Plot')
qqline(mysum$resid)
grid()
dev.off()
(myerror <- as.ts(mysum$resid))
bitmap(file='test5.png')
dum <- cbind(lag(myerror,k=1),myerror)
dum
dum1 <- dum[2:length(myerror),]
dum1
z <- as.data.frame(dum1)
z
plot(z,main=paste('Residual Lag plot, lowess, and regression line'), ylab='values of Residuals', xlab='lagged values of Residuals')
lines(lowess(z))
abline(lm(z))
grid()
dev.off()
bitmap(file='test6.png')
acf(mysum$resid, lag.max=length(mysum$resid)/2, main='Residual Autocorrelation Function')
grid()
dev.off()
bitmap(file='test7.png')
pacf(mysum$resid, lag.max=length(mysum$resid)/2, main='Residual Partial Autocorrelation Function')
grid()
dev.off()
bitmap(file='test8.png')
opar <- par(mfrow = c(2,2), oma = c(0, 0, 1.1, 0))
plot(mylm, las = 1, sub='Residual Diagnostics')
par(opar)
dev.off()
if (n > n25) {
bitmap(file='test9.png')
plot(kp3:nmkm3,gqarr[,2], main='Goldfeld-Quandt test',ylab='2-sided p-value',xlab='breakpoint')
grid()
dev.off()
}
load(file='createtable')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a, 'Multiple Linear Regression - Estimated Regression Equation', 1, TRUE)
a<-table.row.end(a)
myeq <- colnames(x)[1]
myeq <- paste(myeq, '[t] = ', sep='')
for (i in 1:k){
if (mysum$coefficients[i,1] > 0) myeq <- paste(myeq, '+', '')
myeq <- paste(myeq, mysum$coefficients[i,1], sep=' ')
if (rownames(mysum$coefficients)[i] != '(Intercept)') {
myeq <- paste(myeq, rownames(mysum$coefficients)[i], sep='')
if (rownames(mysum$coefficients)[i] != 't') myeq <- paste(myeq, '[t]', sep='')
}
}
myeq <- paste(myeq, ' + e[t]')
a<-table.row.start(a)
a<-table.element(a, myeq)
a<-table.row.end(a)
a<-table.end(a)
table.save(a,file='mytable1.tab')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a,hyperlink('http://www.xycoon.com/ols1.htm','Multiple Linear Regression - Ordinary Least Squares',''), 6, TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Variable',header=TRUE)
a<-table.element(a,'Parameter',header=TRUE)
a<-table.element(a,'S.D.',header=TRUE)
a<-table.element(a,'T-STAT<br />H0: parameter = 0',header=TRUE)
a<-table.element(a,'2-tail p-value',header=TRUE)
a<-table.element(a,'1-tail p-value',header=TRUE)
a<-table.row.end(a)
for (i in 1:k){
a<-table.row.start(a)
a<-table.element(a,rownames(mysum$coefficients)[i],header=TRUE)
a<-table.element(a,mysum$coefficients[i,1])
a<-table.element(a, round(mysum$coefficients[i,2],6))
a<-table.element(a, round(mysum$coefficients[i,3],4))
a<-table.element(a, round(mysum$coefficients[i,4],6))
a<-table.element(a, round(mysum$coefficients[i,4]/2,6))
a<-table.row.end(a)
}
a<-table.end(a)
table.save(a,file='mytable2.tab')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a, 'Multiple Linear Regression - Regression Statistics', 2, TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'Multiple R',1,TRUE)
a<-table.element(a, sqrt(mysum$r.squared))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'R-squared',1,TRUE)
a<-table.element(a, mysum$r.squared)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'Adjusted R-squared',1,TRUE)
a<-table.element(a, mysum$adj.r.squared)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'F-TEST (value)',1,TRUE)
a<-table.element(a, mysum$fstatistic[1])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'F-TEST (DF numerator)',1,TRUE)
a<-table.element(a, mysum$fstatistic[2])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'F-TEST (DF denominator)',1,TRUE)
a<-table.element(a, mysum$fstatistic[3])
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'p-value',1,TRUE)
a<-table.element(a, 1-pf(mysum$fstatistic[1],mysum$fstatistic[2],mysum$fstatistic[3]))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'Multiple Linear Regression - Residual Statistics', 2, TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'Residual Standard Deviation',1,TRUE)
a<-table.element(a, mysum$sigma)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'Sum Squared Residuals',1,TRUE)
a<-table.element(a, sum(myerror*myerror))
a<-table.row.end(a)
a<-table.end(a)
table.save(a,file='mytable3.tab')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a, 'Multiple Linear Regression - Actuals, Interpolation, and Residuals', 4, TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a, 'Time or Index', 1, TRUE)
a<-table.element(a, 'Actuals', 1, TRUE)
a<-table.element(a, 'Interpolation<br />Forecast', 1, TRUE)
a<-table.element(a, 'Residuals<br />Prediction Error', 1, TRUE)
a<-table.row.end(a)
for (i in 1:n) {
a<-table.row.start(a)
a<-table.element(a,i, 1, TRUE)
a<-table.element(a,x[i])
a<-table.element(a,x[i]-mysum$resid[i])
a<-table.element(a,mysum$resid[i])
a<-table.row.end(a)
}
a<-table.end(a)
table.save(a,file='mytable4.tab')
if (n > n25) {
a<-table.start()
a<-table.row.start(a)
a<-table.element(a,'Goldfeld-Quandt test for Heteroskedasticity',4,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'p-values',header=TRUE)
a<-table.element(a,'Alternative Hypothesis',3,header=TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'breakpoint index',header=TRUE)
a<-table.element(a,'greater',header=TRUE)
a<-table.element(a,'2-sided',header=TRUE)
a<-table.element(a,'less',header=TRUE)
a<-table.row.end(a)
for (mypoint in kp3:nmkm3) {
a<-table.row.start(a)
a<-table.element(a,mypoint,header=TRUE)
a<-table.element(a,gqarr[mypoint-kp3+1,1])
a<-table.element(a,gqarr[mypoint-kp3+1,2])
a<-table.element(a,gqarr[mypoint-kp3+1,3])
a<-table.row.end(a)
}
a<-table.end(a)
table.save(a,file='mytable5.tab')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a,'Meta Analysis of Goldfeld-Quandt test for Heteroskedasticity',4,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Description',header=TRUE)
a<-table.element(a,'# significant tests',header=TRUE)
a<-table.element(a,'% significant tests',header=TRUE)
a<-table.element(a,'OK/NOK',header=TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'1% type I error level',header=TRUE)
a<-table.element(a,numsignificant1)
a<-table.element(a,numsignificant1/numgqtests)
if (numsignificant1/numgqtests < 0.01) dum <- 'OK' else dum <- 'NOK'
a<-table.element(a,dum)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'5% type I error level',header=TRUE)
a<-table.element(a,numsignificant5)
a<-table.element(a,numsignificant5/numgqtests)
if (numsignificant5/numgqtests < 0.05) dum <- 'OK' else dum <- 'NOK'
a<-table.element(a,dum)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'10% type I error level',header=TRUE)
a<-table.element(a,numsignificant10)
a<-table.element(a,numsignificant10/numgqtests)
if (numsignificant10/numgqtests < 0.1) dum <- 'OK' else dum <- 'NOK'
a<-table.element(a,dum)
a<-table.row.end(a)
a<-table.end(a)
table.save(a,file='mytable6.tab')
}
 





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