R help - Oct 2011 - Assigning factor names to interaction plot

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

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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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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>