R version 2.12.1 (2010-12-16) Copyright (C) 2010 The R Foundation for Statistical Computing ISBN 3-900051-07-0 Platform: i486-pc-linux-gnu (32-bit) R is free software and comes with ABSOLUTELY NO WARRANTY. You are welcome to redistribute it under certain conditions. Type 'license()' or 'licence()' for distribution details. R is a collaborative project with many contributors. Type 'contributors()' for more information and 'citation()' on how to cite R or R packages in publications. Type 'demo()' for some demos, 'help()' for on-line help, or 'help.start()' for an HTML browser interface to help. 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+ ,58 + ,61 + ,37 + ,133 + ,84601 + ,19354 + ,105406 + ,125 + ,122 + ,2965 + ,347930 + ,136 + ,981 + ,108 + ,125 + ,47 + ,185 + ,68946 + ,22124 + ,174586 + ,174 + ,173 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,4 + ,203 + ,4 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,151 + ,7199 + ,5 + ,74 + ,0 + ,7 + ,0 + ,0 + ,1644 + ,556 + ,4245 + ,6 + ,6 + ,474 + ,46660 + ,20 + ,259 + ,7 + ,12 + ,5 + ,15 + ,6179 + ,2089 + ,21509 + ,13 + ,13 + ,141 + ,17547 + ,5 + ,69 + ,3 + ,0 + ,1 + ,4 + ,3926 + ,2658 + ,7670 + ,3 + ,3 + ,1031 + ,112892 + ,42 + ,277 + ,88 + ,37 + ,43 + ,152 + ,52789 + ,1813 + ,15673 + ,35 + ,35 + ,29 + ,969 + ,2 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,0 + ,1650 + ,189334 + ,62 + ,544 + ,46 + ,47 + ,31 + ,113 + ,100350 + ,17372 + ,75882 + ,80 + ,72) + ,dim=c(13 + ,164) + ,dimnames=list(c('Pageviews' + ,'Total_Time_spent_in_rfc' + ,'Logins' + ,'Course_Compendium_Views' + ,'Compendium_Views_pr_only' + ,'Blogged_Computations' + ,'Reviewed_Compendiums' + ,'submitted_Feedback_Messages_in_Peer_Reviews' + ,'Number_of_characters' + ,'Total_number_of_revisions' + ,'Total_Time' + ,'Hyperlinks' + ,'Blogs') + ,1:164)) > y <- array(NA,dim=c(13,164),dimnames=list(c('Pageviews','Total_Time_spent_in_rfc','Logins','Course_Compendium_Views','Compendium_Views_pr_only','Blogged_Computations','Reviewed_Compendiums','submitted_Feedback_Messages_in_Peer_Reviews','Number_of_characters','Total_number_of_revisions','Total_Time','Hyperlinks','Blogs'),1:164)) > for (i in 1:dim(x)[1]) + { + for (j in 1:dim(x)[2]) + { + y[i,j] <- as.numeric(x[i,j]) + } + } > par1 = 'pearson' > main = 'Correlation Matrix' > panel.tau <- function(x, y, digits=2, prefix='', cex.cor) + { + usr <- par('usr'); on.exit(par(usr)) + par(usr = c(0, 1, 0, 1)) + rr <- cor.test(x, y, method=par1) + r <- round(rr$p.value,2) + txt <- format(c(r, 0.123456789), digits=digits)[1] + txt <- paste(prefix, txt, sep='') + if(missing(cex.cor)) cex <- 0.5/strwidth(txt) + text(0.5, 0.5, txt, cex = cex) + } > panel.hist <- function(x, ...) + { + usr <- par('usr'); on.exit(par(usr)) + par(usr = c(usr[1:2], 0, 1.5) ) + h <- hist(x, plot = FALSE) + breaks <- h$breaks; nB <- length(breaks) + y <- h$counts; y <- y/max(y) + rect(breaks[-nB], 0, breaks[-1], y, col='grey', ...) + } > postscript(file="/var/www/rcomp/tmp/1spx11323870935.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > pairs(t(y),diag.panel=panel.hist, upper.panel=panel.smooth, lower.panel=panel.tau, main=main) > dev.off() null device 1 > > #Note: the /var/www/rcomp/createtable file can be downloaded at http://www.wessa.net/cretab > load(file="/var/www/rcomp/createtable") > > n <- length(y[,1]) > n [1] 13 > a<-table.start() > a<-table.row.start(a) > a<-table.element(a,paste('Correlations for all pairs of data series (method=',par1,')',sep=''),n+1,TRUE) > a<-table.row.end(a) > a<-table.row.start(a) > a<-table.element(a,' ',header=TRUE) > for (i in 1:n) { + a<-table.element(a,dimnames(t(x))[[2]][i],header=TRUE) + } > a<-table.row.end(a) > for (i in 1:n) { + a<-table.row.start(a) + a<-table.element(a,dimnames(t(x))[[2]][i],header=TRUE) + for (j in 1:n) { + r <- cor.test(y[i,],y[j,],method=par1) + a<-table.element(a,round(r$estimate,3)) + } + a<-table.row.end(a) + } > a<-table.end(a) > table.save(a,file="/var/www/rcomp/tmp/2oraz1323870935.tab") > a<-table.start() > a<-table.row.start(a) > a<-table.element(a,'Correlations for all pairs of data series with p-values',4,TRUE) > a<-table.row.end(a) > a<-table.row.start(a) > a<-table.element(a,'pair',1,TRUE) > a<-table.element(a,'Pearson r',1,TRUE) > a<-table.element(a,'Spearman rho',1,TRUE) > a<-table.element(a,'Kendall tau',1,TRUE) > a<-table.row.end(a) > cor.test(y[1,],y[2,],method=par1) Pearson's product-moment correlation data: y[1, ] and y[2, ] t = 27.9661, df = 162, p-value < 2.2e-16 alternative hypothesis: true correlation is not equal to 0 95 percent confidence interval: 0.8796105 0.9332468 sample estimates: cor 0.9101693 > for (i in 1:(n-1)) + { + for (j in (i+1):n) + { + a<-table.row.start(a) + dum <- paste(dimnames(t(x))[[2]][i],';',dimnames(t(x))[[2]][j],sep='') + a<-table.element(a,dum,header=TRUE) + rp <- cor.test(y[i,],y[j,],method='pearson') + a<-table.element(a,round(rp$estimate,4)) + rs <- cor.test(y[i,],y[j,],method='spearman') + a<-table.element(a,round(rs$estimate,4)) + rk <- cor.test(y[i,],y[j,],method='kendall') + a<-table.element(a,round(rk$estimate,4)) + a<-table.row.end(a) + a<-table.row.start(a) + a<-table.element(a,'p-value',header=T) + a<-table.element(a,paste('(',round(rp$p.value,4),')',sep='')) + a<-table.element(a,paste('(',round(rs$p.value,4),')',sep='')) + a<-table.element(a,paste('(',round(rk$p.value,4),')',sep='')) + a<-table.row.end(a) + } + } There were 50 or more warnings (use warnings() to see the first 50) > a<-table.end(a) > table.save(a,file="/var/www/rcomp/tmp/3ofuu1323870935.tab") > > try(system("convert tmp/1spx11323870935.ps tmp/1spx11323870935.png",intern=TRUE)) character(0) > > > proc.time() user system elapsed 4.892 0.088 4.984