File:NZ opinion polls 2005-2008.png

Summary[edit]

 

This chart was created with R.

This graph was created using R's ggplot2 package. Here is the source code, available under GPL version 2 and later as well as the licenses below.

library(reshape)
library(ggplot2)
polls <- read.csv("NZ opinion polls 2006-2008.csv")
polls$Date <- as.Date(polls$Date)
lpolls <- melt(polls[,-3], id.var=c("Poll", "Date"), variable_name="Party")
names(lpolls)[4] <- "Support"
levels(lpolls$Party)[3:4] <- c("NZ First", "Maori Party")
levels(lpolls$Party)[7] <- "United Future"
lpolls$Party <- with(lpolls, reorder(Party, Support, na.rm=TRUE))
p <- ggplot(lpolls[(lpolls$Date >= as.Date("2005-09-17")) & 
    (lpolls$Party %in% c("Labour", "National", "NZ First", "Greens")),], 
    aes(x=Date, y=Support, colour=factor(Party)))
p + geom_point() + stat_smooth() + 
    scale_colour_manual(name = "Party", values = c("black", "forestgreen", "red", "blue")) + 
    scale_x_date(major="4 months", format="%b-%Y") +
    scale_y_continuous(breaks=seq(from=0, to=55, by=5), name="Party support (%)")

Licensing[edit]

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