R version 3.0.1 (2013-05-16) -- "Good Sport"
Copyright (C) 2013 The R Foundation for Statistical Computing
Platform: i686-pc-linux-gnu (32-bit)

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> x <- c(20.5,20.2,19.4,19.2,18.8,18.8,22.6,23.3,23,21.4,19.9,18.8,18.6,18.4,18.6,19.9,19.2,18.4,21.1,20.5,19.1,18.1,17,17.1,17.4,16.8,15.3,14.3,13.4,15.3,22.1,23.7,22.2,19.5,16.6,17.3,19.8,21.2,21.5,20.6,19.1,19.6,23.4,24.3,24.1,22.8,22.5,23.8,24.9,25.2,24.3,22.8,20.7,19.8,22.5,22.6,22.5,21.8,21.2,20.6,19.9,18.7,17.6,16.4,15.9,16.8,22.8,24,22.2,17.9,16,16)
> par1 = '12'
> par1 <- '12'
> #'GNU S' R Code compiled by R2WASP v. 1.2.291 ()
> #Author: root
> #To cite this work: Wessa P., (2012), Standard Deviation Plot (v1.0.2) in Free Statistics Software (v$_version), Office for Research Development and Education, URL http://www.wessa.net/rwasp_sdplot.wasp/
> #Source of accompanying publication: Office for Research, Development, and Education
> #
> par1 <- as.numeric(par1)
> (n <- length(x))
[1] 72
> (np <- floor(n / par1))
[1] 6
> arr <- array(NA,dim=c(par1,np+1))
> ari <- array(0,dim=par1)
> j <- 0
> for (i in 1:n)
+ {
+ j = j + 1
+ ari[j] = ari[j] + 1
+ arr[j,ari[j]] <- x[i]
+ if (j == par1) j = 0
+ }
> ari
 [1] 6 6 6 6 6 6 6 6 6 6 6 6
> arr
      [,1] [,2] [,3] [,4] [,5] [,6] [,7]
 [1,] 20.5 18.6 17.4 19.8 24.9 19.9   NA
 [2,] 20.2 18.4 16.8 21.2 25.2 18.7   NA
 [3,] 19.4 18.6 15.3 21.5 24.3 17.6   NA
 [4,] 19.2 19.9 14.3 20.6 22.8 16.4   NA
 [5,] 18.8 19.2 13.4 19.1 20.7 15.9   NA
 [6,] 18.8 18.4 15.3 19.6 19.8 16.8   NA
 [7,] 22.6 21.1 22.1 23.4 22.5 22.8   NA
 [8,] 23.3 20.5 23.7 24.3 22.6 24.0   NA
 [9,] 23.0 19.1 22.2 24.1 22.5 22.2   NA
[10,] 21.4 18.1 19.5 22.8 21.8 17.9   NA
[11,] 19.9 17.0 16.6 22.5 21.2 16.0   NA
[12,] 18.8 17.1 17.3 23.8 20.6 16.0   NA
> arr.sd <- array(NA,dim=par1)
> arr.range <- array(NA,dim=par1)
> arr.iqr <- array(NA,dim=par1)
> for (j in 1:par1)
+ {
+ arr.sd[j] <- sqrt(var(arr[j,],na.rm=TRUE))
+ arr.range[j] <- max(arr[j,],na.rm=TRUE) - min(arr[j,],na.rm=TRUE)
+ arr.iqr[j] <- quantile(arr[j,],0.75,na.rm=TRUE) - quantile(arr[j,],0.25,na.rm=TRUE)
+ }
> overall.sd <- sqrt(var(x))
> overall.range <- max(x) - min(x)
> overall.iqr <- quantile(x,0.75) - quantile(x,0.25)
> postscript(file="/var/wessaorg/rcomp/tmp/1xqfc1369615168.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> plot(arr.sd,type='b',ylab='S.D.',main='Standard Deviation Plot',xlab='Periodic Index')
> mtext(paste('# blocks = ',np))
> abline(overall.sd,0)
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/2suv51369615168.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> plot(arr.range,type='b',ylab='range',main='Range Plot',xlab='Periodic Index')
> mtext(paste('# blocks = ',np))
> abline(overall.range,0)
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/3gg301369615168.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> plot(arr.iqr,type='b',ylab='IQR',main='Interquartile Range Plot',xlab='Periodic Index')
> mtext(paste('# blocks = ',np))
> abline(overall.iqr,0)
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/49fhl1369615168.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> z <- data.frame(t(arr))
> names(z) <- c(1:par1)
> (boxplot(z,notch=TRUE,col='grey',xlab='Periodic Index',ylab='Value',main='Notched Box Plots - Periodic Subseries'))
$stats
      [,1]  [,2] [,3]  [,4]  [,5] [,6]  [,7] [,8]  [,9] [,10] [,11] [,12]
[1,] 17.40 16.80 15.3 14.30 13.40 15.3 21.10 22.6 22.20 17.90 16.00 16.00
[2,] 18.60 18.40 17.6 16.40 15.90 16.8 22.10 22.6 22.20 18.10 16.60 17.10
[3,] 19.85 19.45 19.0 19.55 18.95 18.6 22.55 23.5 22.35 20.45 18.45 18.05
[4,] 20.50 21.20 21.5 20.60 19.20 19.6 22.80 24.0 23.00 21.80 21.20 20.60
[5,] 20.50 25.20 24.3 22.80 20.70 19.8 23.40 24.3 24.10 22.80 22.50 23.80

$n
 [1] 6 6 6 6 6 6 6 6 6 6 6 6

$conf
         [,1]     [,2]     [,3]     [,4]     [,5]     [,6]     [,7]     [,8]
[1,] 18.62444 17.64391 16.48437 16.84086 16.82139 16.79391 22.09848 22.59695
[2,] 21.07556 21.25609 21.51563 22.25914 21.07861 20.40609 23.00152 24.40305
         [,9]    [,10]    [,11]    [,12]
[1,] 21.83397 18.06338 15.48285 15.79239
[2,] 22.86603 22.83662 21.41715 20.30761

$out
[1] 24.9 20.5 19.1

$group
[1] 1 8 9

$names
 [1] "1"  "2"  "3"  "4"  "5"  "6"  "7"  "8"  "9"  "10" "11" "12"

Warning message:
In bxp(list(stats = c(17.4, 18.6, 19.85, 20.5, 20.5, 16.8, 18.4,  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/5cuwx1369615168.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> z <- data.frame(arr)
> names(z) <- c(1:np)
> (boxplot(z,notch=TRUE,col='grey',xlab='Block Index',ylab='Value',main='Notched Box Plots - Sequential Blocks'))
$stats
      [,1]  [,2]  [,3] [,4]  [,5]  [,6] [,7]
[1,] 18.80 17.00 13.40 19.1 19.80 15.90   NA
[2,] 19.00 18.25 15.30 20.2 20.95 16.20   NA
[3,] 20.05 18.60 17.05 22.0 22.50 17.75   NA
[4,] 22.00 19.55 20.80 23.6 23.55 21.05   NA
[5,] 23.30 21.10 23.70 24.3 25.20 24.00   NA

$n
[1] 12 12 12 12 12 12  0

$conf
         [,1]     [,2]     [,3]     [,4]     [,5]     [,6] [,7]
[1,] 18.68168 18.00706 14.54141 20.44924 21.31412 15.53788   NA
[2,] 21.41832 19.19294 19.55859 23.55076 23.68588 19.96212   NA

$out
numeric(0)

$group
numeric(0)

$names
[1] "1" "2" "3" "4" "5" "6" NA 

Warning message:
In bxp(list(stats = c(18.8, 19, 20.05, 22, 23.3, 17, 18.25, 18.6,  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> postscript(file="/var/wessaorg/rcomp/tmp/61eln1369615168.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> z <- data.frame(cbind(arr.sd,arr.range,arr.iqr))
> names(z) <- list('S.D.','Range','IQR')
> (boxplot(z,notch=TRUE,col='grey',ylab='Overall Variability',main='Notched Box Plots'))
$stats
         [,1] [,2]   [,3]
[1,] 0.773089  2.3 0.5500
[2,] 1.708280  4.7 1.3000
[3,] 2.623098  6.9 2.5125
[4,] 2.899507  8.1 3.1875
[5,] 3.133528  9.0 4.1750

$n
[1] 12 12 12

$conf
         [,1]     [,2]     [,3]
[1,] 2.079771 5.349237 1.651599
[2,] 3.166425 8.450763 3.373401

$out
numeric(0)

$group
numeric(0)

$names
[1] "S.D."  "Range" "IQR"  

Warning message:
In bxp(list(stats = c(0.773089041874651, 1.70827950456957, 2.62309810938428,  :
  some notches went outside hinges ('box'): maybe set notch=FALSE
> dev.off()
null device 
          1 
> 
> try(system("convert tmp/1xqfc1369615168.ps tmp/1xqfc1369615168.png",intern=TRUE))
character(0)
> try(system("convert tmp/2suv51369615168.ps tmp/2suv51369615168.png",intern=TRUE))
character(0)
> try(system("convert tmp/3gg301369615168.ps tmp/3gg301369615168.png",intern=TRUE))
character(0)
> try(system("convert tmp/49fhl1369615168.ps tmp/49fhl1369615168.png",intern=TRUE))
character(0)
> try(system("convert tmp/5cuwx1369615168.ps tmp/5cuwx1369615168.png",intern=TRUE))
character(0)
> try(system("convert tmp/61eln1369615168.ps tmp/61eln1369615168.png",intern=TRUE))
character(0)
> 
> 
> proc.time()
   user  system elapsed 
  3.915   0.821   5.157