Great.
Thank you for your suggestions.
In case other people are interested too, this is what I got now.
I was able to
#added labels for x-axis and y-axis
p + scale_y_continuous("number of votes")
p + scale_x_continuous("number of votes")
# specify breaks
p + scale_x_continuous(breaks=1:4)
#overwriting labels
p+scale_colour_hue(breaks='A', labels='label A')+
scale_colour_hue(breaks='B', labels='label B')
# adding line with abline
> p + geom_abline(intercept = 8, slope=5, colour = "blue", size = 1, subset
> = .(COUNTRY == 'low'))+ geom_abline(intercept = 12, slope=9, colour =
> "green", size = 1, subset = .(COUNTRY == 'low'))
Thank you
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