R version 3.0.2 (2013-09-25) -- "Frisbee Sailing" Copyright (C) 2013 The R Foundation for Statistical Computing Platform: x86_64-pc-linux-gnu (64-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. Type 'q()' to quit R. > x <- c(0.196,0.198,0.202,0.209,0.206,0.208,0.212,0.207,0.208,0.209,0.206,0.206,0.209,0.209,0.206,0.206,0.209,0.205,0.201,0.209,0.199,0.204,0.210,0.210,0.206,0.215,0.216,0.206,0.206,0.213,0.207,0.207,0.207,0.216,0.216,0.214,0.211,0.206,0.208,0.216,0.214,0.206,0.209,0.207,0.208,0.207,0.213,0.212,0.201,0.217,0.219,0.212) > par2 = '60' > par1 = '40' > par2 <- '60' > par1 <- '40' > #'GNU S' R Code compiled by R2WASP v. 1.2.327 () > #Author: root > #To cite this work: Wessa P., (2013), Maximum-likelihood Weibull Distribution Fitting (v1.0.3) in Free Statistics Software (v$_version), Office for Research Development and Education, URL http://www.wessa.net/rwasp_fitdistrweibull.wasp/ > #Source of accompanying publication: Office for Research, Development, and Education > # > library(MASS) > PPCCWeibull <- function(shape, scale, x) + { + x <- sort(x) + pp <- ppoints(x) + cor(qweibull(pp, shape=shape, scale=scale), x) + } > par1 <- as.numeric(par1) > par2 <- as.numeric(par2) > if (par1 < 0.1) par1 <- 0.1 > if (par1 > 50) par1 <- 50 > if (par2 < 0.1) par2 <- 0.1 > if (par2 > 50) par2 <- 50 > par1h <- par1*10 > par2h <- par2*10 > sortx <- sort(x) > c <- array(NA,dim=c(par2h)) > for (i in par1h:par2h) + { + c[i] <- cor(qweibull(ppoints(x), shape=i/10,scale=2),sortx) + } > postscript(file="/var/wessaorg/rcomp/tmp/14wge1429726518.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > plot((par1h:par2h)/10,c[par1h:par2h],xlab='shape',ylab='correlation',main='PPCC Plot - Weibull') > dev.off() null device 1 > f<-fitdistr(x, 'weibull') > f$estimate shape scale 45.886950 0.210808 > f$sd shape scale 4.723691631 0.000674395 > xlab <- paste('Weibull(shape=',round(f$estimate[[1]],2)) > xlab <- paste(xlab,', scale=') > xlab <- paste(xlab,round(f$estimate[[2]],2)) > xlab <- paste(xlab,')') > postscript(file="/var/wessaorg/rcomp/tmp/2ohbw1429726518.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) > qqplot(qweibull(ppoints(x), shape=f$estimate[[1]], scale=f$estimate[[2]]), x, main='QQ plot (Weibull)', xlab=xlab ) > grid() > dev.off() null device 1 > > #Note: the /var/wessaorg/rcomp/createtable file can be downloaded at http://www.wessa.net/cretab > load(file="/var/wessaorg/rcomp/createtable") > > a<-table.start() > a<-table.row.start(a) > a<-table.element(a,'Parameter',1,TRUE) > a<-table.element(a,'Estimated Value',1,TRUE) > a<-table.element(a,'Standard Deviation',1,TRUE) > a<-table.row.end(a) > a<-table.row.start(a) > a<-table.element(a,'shape',header=TRUE) > a<-table.element(a,f$estimate[1]) > a<-table.element(a,f$sd[1]) > a<-table.row.end(a) > a<-table.row.start(a) > a<-table.element(a,'scale',header=TRUE) > a<-table.element(a,f$estimate[2]) > a<-table.element(a,f$sd[2]) > a<-table.row.end(a) > a<-table.end(a) > table.save(a,file="/var/wessaorg/rcomp/tmp/3v9tl1429726518.tab") > > try(system("convert tmp/14wge1429726518.ps tmp/14wge1429726518.png",intern=TRUE)) character(0) > try(system("convert tmp/2ohbw1429726518.ps tmp/2ohbw1429726518.png",intern=TRUE)) character(0) > > > proc.time() user system elapsed 0.916 0.168 1.083