Dear Robin and Gerrit, I am unable to see the difference in the plot in the two cases ...
df <- data.frame(year = seq(2011, 2018), value = seq(10, 80, 10))
df$color <- 'black'
df[df$value<33,]$color <- 'blue'
df[df$value>66,]$color <- 'red'
file <- "/tmp/robin.png"
width <- 1000
height <- 1000
res <- 150
png(file=file, width=width, height=height, res=res)
par(mfrow=c(2,1))
stripchart(df$value ~ df$year, pch=18, col=df$color, method='stack',
main="stripchart with color column as col")
stripchart(df$value ~ df$year, pch=18, method='stack', main="stripchart
with black basis")
points(df[df$color=='blue',]$value, df[df$color=='blue',]$year-2010,
type='p', pch=18, col='blue')
points(df[df$color=='red',]$value, df[df$color=='red',]$year-2010,
type='p', pch=18, col='red')
dev.off()
Best,
Rasmus
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