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Type 'q()' to quit R. > x <- array(list(192.37,47.91,3720,0,601.73,192.65,51.56,3683,0,564.01,193.77,56.06,3635,0,513.92,194.54,60.36,3589,0,492.44,198.63,64.19,3590,0,540.36,202.3,67.31,3609,0,520.92,206.05,68.18,3632,0,451.40,210.94,69.24,365,0,397.62,220.57,70.05,3716,0,408.69,228.55,72.22,3760,0,390.15,235.61,74.72,3794,0,361.02,239.86,77.08,3798,0,304.83,243.05,78.81,3779,0,307.09,241.37,80.78,3872,0,270.57,249.31,82.71,3857,0,316.00,259.98,83.76,3914,0,308.64,262.85,85.26,3939,0,282.78,273.13,86.53,3966,0,297.18,278.37,87.32,4035,0,287.67,288.19,88.31,4090,0,259.49,299.13,90.67,4173,0,268.33,301.26,92.88,4231,0,301.05,305.36,94.33,4226,0,310.44,307.75,95.75,4230,0,329.26,317.2,97.53,4270,0,319.59,323.6,100,4331,0,329.16,332.31,102.33,4384,0,381.06,341.59,104.19,4455,0,487.13,344.3,108.87,4532,1,527.37,335.17,108.86,4515,1,606.35),dim=c(5,30),dimnames=list(c('BBP','inflatie','werkeloosheid','crisis','goudprijzen'),1:30)) > y <- array(NA,dim=c(5,30),dimnames=list(c('BBP','inflatie','werkeloosheid','crisis','goudprijzen'),1:30)) > for (i in 1:dim(x)[1]) + { + for (j in 1:dim(x)[2]) + { + y[i,j] <- as.numeric(x[i,j]) + } + } > par3 = 'No Linear Trend' > par2 = 'Do not include Seasonal Dummies' > par1 = '1' > library(lattice) > library(lmtest) Loading required package: zoo > 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 BBP inflatie werkeloosheid crisis goudprijzen 1 192.37 47.91 3720 0 601.73 2 192.65 51.56 3683 0 564.01 3 193.77 56.06 3635 0 513.92 4 194.54 60.36 3589 0 492.44 5 198.63 64.19 3590 0 540.36 6 202.30 67.31 3609 0 520.92 7 206.05 68.18 3632 0 451.40 8 210.94 69.24 365 0 397.62 9 220.57 70.05 3716 0 408.69 10 228.55 72.22 3760 0 390.15 11 235.61 74.72 3794 0 361.02 12 239.86 77.08 3798 0 304.83 13 243.05 78.81 3779 0 307.09 14 241.37 80.78 3872 0 270.57 15 249.31 82.71 3857 0 316.00 16 259.98 83.76 3914 0 308.64 17 262.85 85.26 3939 0 282.78 18 273.13 86.53 3966 0 297.18 19 278.37 87.32 4035 0 287.67 20 288.19 88.31 4090 0 259.49 21 299.13 90.67 4173 0 268.33 22 301.26 92.88 4231 0 301.05 23 305.36 94.33 4226 0 310.44 24 307.75 95.75 4230 0 329.26 25 317.20 97.53 4270 0 319.59 26 323.60 100.00 4331 0 329.16 27 332.31 102.33 4384 0 381.06 28 341.59 104.19 4455 0 487.13 29 344.30 108.87 4532 1 527.37 30 335.17 108.86 4515 1 606.35 > k <- length(x[1,]) > df <- as.data.frame(x) > (mylm <- lm(df)) Call: lm(formula = df) Coefficients: (Intercept) inflatie werkeloosheid crisis goudprijzen -41.681149 3.168896 0.005673 -23.209733 0.059945 > (mysum <- summary(mylm)) Call: lm(formula = df) Residuals: Min 1Q Median 3Q Max -21.0190 -4.9444 -0.5404 6.4199 25.0537 Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) -41.681149 24.117987 -1.728 0.0963 . inflatie 3.168896 0.209296 15.141 4.25e-14 *** werkeloosheid 0.005673 0.003256 1.743 0.0937 . crisis -23.209733 12.786228 -1.815 0.0815 . goudprijzen 0.059945 0.028657 2.092 0.0468 * --- Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1 Residual standard error: 10.79 on 25 degrees of freedom Multiple R-squared: 0.9614, Adjusted R-squared: 0.9552 F-statistic: 155.6 on 4 and 25 DF, p-value: < 2.2e-16 > 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)$p.value + } + if (gqarr[mypoint-kp3+1,2] < 0.01) numsignificant1 <- numsignificant1 + 1 + if (gqarr[mypoint-kp3+1,2] < 0.05) numsignificant5 <- numsignificant5 + 1 + if (gqarr[mypoint-kp3+1,2] < 0.10) numsignificant10 <- numsignificant10 + 1 + } + gqarr + } [,1] [,2] [,3] [1,] 0.5229587 0.954082665 0.477041332 [2,] 0.9446718 0.110656330 0.055328165 [3,] 0.9718978 0.056204379 0.028102190 [4,] 0.9713830 0.057233952 0.028616976 [5,] 0.9490981 0.101803883 0.050901941 [6,] 0.9559239 0.088152241 0.044076121 [7,] 0.9935907 0.012818668 0.006409334 [8,] 0.9949628 0.010074497 0.005037249 [9,] 0.9969381 0.006123762 0.003061881 [10,] 0.9976731 0.004653727 0.002326864 [11,] 0.9978725 0.004254985 0.002127492 [12,] 0.9961545 0.007690964 0.003845482 [13,] 0.9958481 0.008303877 0.004151939 [14,] 0.9961515 0.007696912 0.003848456 [15,] 0.9903564 0.019287177 0.009643588 > postscript(file="/var/www/rcomp/tmp/14g2a1293562560.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > plot(x[,1], type='l', main='Actuals and Interpolation', ylab='value of Actuals and Interpolation (dots)', xlab='time or index') > points(x[,1]-mysum$resid) > grid() > dev.off() null device 1 > postscript(file="/var/www/rcomp/tmp/2xp1e1293562560.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > plot(mysum$resid, type='b', pch=19, main='Residuals', ylab='value of Residuals', xlab='time or index') > grid() > dev.off() null device 1 > postscript(file="/var/www/rcomp/tmp/3xp1e1293562560.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > hist(mysum$resid, main='Residual Histogram', xlab='values of Residuals') > grid() > dev.off() null device 1 > postscript(file="/var/www/rcomp/tmp/4xp1e1293562560.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > densityplot(~mysum$resid,col='black',main='Residual Density Plot', xlab='values of Residuals') > dev.off() null device 1 > postscript(file="/var/www/rcomp/tmp/58g0y1293562560.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > qqnorm(mysum$resid, main='Residual Normal Q-Q Plot') > qqline(mysum$resid) > grid() > dev.off() null device 1 > (myerror <- as.ts(mysum$resid)) Time Series: Start = 1 End = 30 Frequency = 1 1 2 3 4 5 6 25.0536648 16.2382231 6.3731428 -4.9345215 -15.8596143 -21.0190415 7 8 9 10 11 12 -15.9891186 7.3007901 -5.3112872 -3.3460492 -2.6549989 -2.5379979 13 14 15 16 17 18 -4.8578678 -11.1190443 -11.9331973 -4.4727315 -4.9477431 0.2913732 19 20 21 22 23 24 3.2065518 11.2665457 13.7271450 6.5634366 5.5340243 2.2733399 25 26 27 28 29 30 6.4354321 4.0885089 2.0031619 -1.3721271 6.8681453 -6.8681453 > postscript(file="/var/www/rcomp/tmp/68g0y1293562560.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > dum <- cbind(lag(myerror,k=1),myerror) > dum Time Series: Start = 0 End = 30 Frequency = 1 lag(myerror, k = 1) myerror 0 25.0536648 NA 1 16.2382231 25.0536648 2 6.3731428 16.2382231 3 -4.9345215 6.3731428 4 -15.8596143 -4.9345215 5 -21.0190415 -15.8596143 6 -15.9891186 -21.0190415 7 7.3007901 -15.9891186 8 -5.3112872 7.3007901 9 -3.3460492 -5.3112872 10 -2.6549989 -3.3460492 11 -2.5379979 -2.6549989 12 -4.8578678 -2.5379979 13 -11.1190443 -4.8578678 14 -11.9331973 -11.1190443 15 -4.4727315 -11.9331973 16 -4.9477431 -4.4727315 17 0.2913732 -4.9477431 18 3.2065518 0.2913732 19 11.2665457 3.2065518 20 13.7271450 11.2665457 21 6.5634366 13.7271450 22 5.5340243 6.5634366 23 2.2733399 5.5340243 24 6.4354321 2.2733399 25 4.0885089 6.4354321 26 2.0031619 4.0885089 27 -1.3721271 2.0031619 28 6.8681453 -1.3721271 29 -6.8681453 6.8681453 30 NA -6.8681453 > dum1 <- dum[2:length(myerror),] > dum1 lag(myerror, k = 1) myerror [1,] 16.2382231 25.0536648 [2,] 6.3731428 16.2382231 [3,] -4.9345215 6.3731428 [4,] -15.8596143 -4.9345215 [5,] -21.0190415 -15.8596143 [6,] -15.9891186 -21.0190415 [7,] 7.3007901 -15.9891186 [8,] -5.3112872 7.3007901 [9,] -3.3460492 -5.3112872 [10,] -2.6549989 -3.3460492 [11,] -2.5379979 -2.6549989 [12,] -4.8578678 -2.5379979 [13,] -11.1190443 -4.8578678 [14,] -11.9331973 -11.1190443 [15,] -4.4727315 -11.9331973 [16,] -4.9477431 -4.4727315 [17,] 0.2913732 -4.9477431 [18,] 3.2065518 0.2913732 [19,] 11.2665457 3.2065518 [20,] 13.7271450 11.2665457 [21,] 6.5634366 13.7271450 [22,] 5.5340243 6.5634366 [23,] 2.2733399 5.5340243 [24,] 6.4354321 2.2733399 [25,] 4.0885089 6.4354321 [26,] 2.0031619 4.0885089 [27,] -1.3721271 2.0031619 [28,] 6.8681453 -1.3721271 [29,] -6.8681453 6.8681453 > z <- as.data.frame(dum1) > z lag(myerror, k = 1) myerror 1 16.2382231 25.0536648 2 6.3731428 16.2382231 3 -4.9345215 6.3731428 4 -15.8596143 -4.9345215 5 -21.0190415 -15.8596143 6 -15.9891186 -21.0190415 7 7.3007901 -15.9891186 8 -5.3112872 7.3007901 9 -3.3460492 -5.3112872 10 -2.6549989 -3.3460492 11 -2.5379979 -2.6549989 12 -4.8578678 -2.5379979 13 -11.1190443 -4.8578678 14 -11.9331973 -11.1190443 15 -4.4727315 -11.9331973 16 -4.9477431 -4.4727315 17 0.2913732 -4.9477431 18 3.2065518 0.2913732 19 11.2665457 3.2065518 20 13.7271450 11.2665457 21 6.5634366 13.7271450 22 5.5340243 6.5634366 23 2.2733399 5.5340243 24 6.4354321 2.2733399 25 4.0885089 6.4354321 26 2.0031619 4.0885089 27 -1.3721271 2.0031619 28 6.8681453 -1.3721271 29 -6.8681453 6.8681453 > 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() null device 1 > postscript(file="/var/www/rcomp/tmp/71q0k1293562560.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > acf(mysum$resid, lag.max=length(mysum$resid)/2, main='Residual Autocorrelation Function') > grid() > dev.off() null device 1 > postscript(file="/var/www/rcomp/tmp/81q0k1293562560.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > pacf(mysum$resid, lag.max=length(mysum$resid)/2, main='Residual Partial Autocorrelation Function') > grid() > dev.off() null device 1 > postscript(file="/var/www/rcomp/tmp/9thzm1293562560.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > opar <- par(mfrow = c(2,2), oma = c(0, 0, 1.1, 0)) > plot(mylm, las = 1, sub='Residual Diagnostics') Warning messages: 1: In sqrt(crit * p * (1 - hh)/hh) : NaNs produced 2: In sqrt(crit * p * (1 - hh)/hh) : NaNs produced > par(opar) > dev.off() null device 1 > if (n > n25) { + postscript(file="/var/www/rcomp/tmp/10thzm1293562560.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) + plot(kp3:nmkm3,gqarr[,2], main='Goldfeld-Quandt test',ylab='2-sided p-value',xlab='breakpoint') + grid() + dev.off() + } null device 1 > > #Note: the /var/www/rcomp/createtable file can be downloaded at http://www.wessa.net/cretab > load(file="/var/www/rcomp/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$coefficients)[i] != 't') myeq <- paste(myeq, '[t]', sep='') + } + } > myeq <- paste(myeq, ' + e[t]') > a<-table.row.start(a) > a<-table.element(a, myeq) > a<-table.row.end(a) > a<-table.end(a) > table.save(a,file="/var/www/rcomp/tmp/11fixs1293562560.tab") > a<-table.start() > a<-table.row.start(a) > a<-table.element(a,hyperlink('http://www.xycoon.com/ols1.htm','Multiple Linear Regression - Ordinary Least Squares',''), 6, TRUE) > a<-table.row.end(a) > a<-table.row.start(a) > a<-table.element(a,'Variable',header=TRUE) > a<-table.element(a,'Parameter',header=TRUE) > a<-table.element(a,'S.D.',header=TRUE) > a<-table.element(a,'T-STAT
H0: parameter = 0',header=TRUE) > a<-table.element(a,'2-tail p-value',header=TRUE) > a<-table.element(a,'1-tail p-value',header=TRUE) > a<-table.row.end(a) > for (i in 1:k){ + a<-table.row.start(a) + a<-table.element(a,rownames(mysum$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$coefficients[i,4]/2,6)) + a<-table.row.end(a) + } > a<-table.end(a) > table.save(a,file="/var/www/rcomp/tmp/12i0wg1293562560.tab") > a<-table.start() > a<-table.row.start(a) > a<-table.element(a, 'Multiple Linear Regression - Regression Statistics', 2, TRUE) > a<-table.row.end(a) > a<-table.row.start(a) > a<-table.element(a, 'Multiple R',1,TRUE) > a<-table.element(a, sqrt(mysum$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$sigma) > a<-table.row.end(a) > a<-table.row.start(a) > a<-table.element(a, 'Sum Squared Residuals',1,TRUE) > a<-table.element(a, sum(myerror*myerror)) > a<-table.row.end(a) > a<-table.end(a) > table.save(a,file="/var/www/rcomp/tmp/137jta1293562560.tab") > a<-table.start() > a<-table.row.start(a) > a<-table.element(a, 'Multiple Linear Regression - Actuals, Interpolation, and Residuals', 4, TRUE) > a<-table.row.end(a) > a<-table.row.start(a) > a<-table.element(a, 'Time or Index', 1, TRUE) > a<-table.element(a, 'Actuals', 1, TRUE) > a<-table.element(a, 'Interpolation
Forecast', 1, TRUE) > a<-table.element(a, 'Residuals
Prediction Error', 1, TRUE) > a<-table.row.end(a) > for (i in 1:n) { + a<-table.row.start(a) + a<-table.element(a,i, 1, TRUE) + a<-table.element(a,x[i]) + a<-table.element(a,x[i]-mysum$resid[i]) + a<-table.element(a,mysum$resid[i]) + a<-table.row.end(a) + } > a<-table.end(a) > table.save(a,file="/var/www/rcomp/tmp/14zasv1293562560.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="/var/www/rcomp/tmp/153brj1293562560.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="/var/www/rcomp/tmp/16zl6r1293562560.tab") + } > > try(system("convert tmp/14g2a1293562560.ps tmp/14g2a1293562560.png",intern=TRUE)) character(0) > try(system("convert tmp/2xp1e1293562560.ps tmp/2xp1e1293562560.png",intern=TRUE)) character(0) > try(system("convert tmp/3xp1e1293562560.ps tmp/3xp1e1293562560.png",intern=TRUE)) character(0) > try(system("convert tmp/4xp1e1293562560.ps tmp/4xp1e1293562560.png",intern=TRUE)) character(0) > try(system("convert tmp/58g0y1293562560.ps tmp/58g0y1293562560.png",intern=TRUE)) character(0) > try(system("convert tmp/68g0y1293562560.ps tmp/68g0y1293562560.png",intern=TRUE)) character(0) > try(system("convert tmp/71q0k1293562560.ps tmp/71q0k1293562560.png",intern=TRUE)) character(0) > try(system("convert tmp/81q0k1293562560.ps tmp/81q0k1293562560.png",intern=TRUE)) character(0) > try(system("convert tmp/9thzm1293562560.ps tmp/9thzm1293562560.png",intern=TRUE)) character(0) > try(system("convert tmp/10thzm1293562560.ps tmp/10thzm1293562560.png",intern=TRUE)) character(0) > > > proc.time() user system elapsed 2.750 1.680 4.488