File:Ws-el-price-2009-2012red.svg

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Original file (SVG file, nominally 578 × 434 pixels, file size: 44 KB)

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Description
English: New Zealand demand-weighted daily average wholesale price of electricity Data from New Zealand Electricity Authority http://www.reports.ea.govt.nz/OnlineReports.aspx
Date
Source Own work
Author Mrfebruary
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R code

p <- read.csv("demandweighteddailyaverageprice2012.csv", skip = 0,header=TRUE, sep=",", na.strings="na", dec=".", strip.white=TRUE)
#examine data
str(p)
'data.frame':	1152 obs. of  2 variables:
 $ Date : Factor w/ 1152 levels "10/01/2010","10/01/2011",..: 501 545 583 621 659 697 735 773 809 844 ...
 $ Price: num  46.5 43.5 45.5 46.5 53.8 ...
# 5 number summary of price
summary(p$Price)
     Min.   1st Qu.    Median      Mean   3rd Qu.      Max. 
   0.6819   38.0900   62.0500   71.7400   91.6000 2911.0000 
# convert p$Price into time series 
pts<-ts(p$Price, frequency = 365, start = c(2009, 201))
# examine time series object
str(pts)
Time-Series [1:1152] from 2010 to 2013: 46.5 43.5 45.5 46.5 53.8 ...
# load SVG device
library("RSVGTipsDevice")
# define name and size of SVG graphic to be created by SVG device
devSVGTips(file="ws-el-price-2009-2012red.svg",toolTipMode=0,width=8,height=6)
# plot commands
plot(pts,ylim=c(0,200),axes="FALSE",type="l",col="darkgrey",cex.main=1.6, main="New Zealand wholesale electricity prices 2009 - 2012",las=1,xlab="Date",ylab="$NZ/MWh")
axis(side=1, las=1,line =0 ,at=c(2009.5,2010.0,2010.5,2011.0,2011.5,2012.0,2012.5),  labels=c("June 2009","Jan 2010","June 2010","Jan 2011","June 2011","Jan 2012","June 2012"))
axis(side=2, las=2)
grid()
lines(lowess(pts,f = 14/1152),type="l",col=2,lty=1,lwd=3)
legend("top",bty='n',bg="white", c("price demand weighted daily average","", "price lowess smoothed f = 14 days"), lty = c(1,NA,1),lwd=c(1,NA,2), pch=c(NA,NA,NA),col = c(1,NA,2))
box(lwd=2)
# turn off plotting device (SVG)
dev.off()

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I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
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Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

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Date/TimeThumbnailDimensionsUserComment
current02:03, 6 October 2012Thumbnail for version as of 02:03, 6 October 2012578 × 434 (44 KB)Mrfebruary (talk | contribs)User created page with UploadWizard

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