[R] Assigning factor names to interaction plot

[Dennis Murphy]

Hi:

A small toy example:

fakedata <- data.frame(group = factor(rep(1:3, each = 10), labels =
paste('Therapy', 1:3)),
                      city = factor(rep(c('Amsterdam', 'Rotterdam'), each = 5)),
                     pressure = rnorm(30))
with(fakedata, interaction.plot(group, city, pressure, type="b",
                 col= c(1:2),
                 leg.bty="o", leg.bg="skyblue", lwd=1, pch=c(18,24,22),
                 xlab="Group",
                 ylab="Pressure",
                 main="Interaction Plot")
    )

HTH,
Dennis

On Mon, Oct 3, 2011 at 5:11 AM, flokke <ingaschwabe at gmail.com> wrote:
> Hi everyone,
> I have the following problem:
>
> I have three variables, 'group', 'city' and 'pressure'
>
> There is an interaction effect between group and city and I'd like to show
> this in an interaction plot:
>
> interaction.plot(group, city, pressure, type="b",
>                 col= c(1:2),
>                 leg.bty="o", leg.bg="blue", lwd=1, pch=c(18,24,22),
>                 xlab="Group",
>                 ylab="Pressure",
>                 main="Interaction Plot")
>
> My problem is that I cant find a proper argument to pass factor names to the
> variables 'group' and 'city'.
>
> In the interaction plot now the groups are referred to as '1', '2' and '3'
> and the citys are referred to '1', 2'. Hoewever, Id like to pass
> string character names to those ('Therapy 1, 'therapy 2 and therapy 3). I'd
> also like to pass
> string character names to the varibale 'city' ('Amsterdam', "Rotterdam',
> etc.)
>
> I'm a quite new user (since two weeks), and normally I can easily find the
> solution to my problems on
> the internet, but however this time I'm frustrated because I cant find
> solutions that are helping me.
>
> I'd be very glad if you could give me a hint or could show me how to deal
> with this problem.
>
> Cheers,
> Maria
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Assigning-factor-names-to-interaction-plot-tp3867311p3867311.html
> Sent from the R help mailing list archive at Nabble.com.
>
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