[R] struggling to plot subgroups

[Gabor Grothendieck]

To plot this with classic graphics convert data frame from
long to wide format using one of the three alternatives below
and then plot:

# 1. subset
DFm <- subset(DF, gender == "m")
DFf <- subset(DF, gender == "f")
DFw <- cbind(DFm[1], xBar.m = DFm[,3], xBar.f = DFf[,3])

# 2. reshape
DFw <- reshape(DF, dir = "wide", timevar = "gender", idvar = "freq")

# 3. cast/melt from the reshape package
library(reshape)
DFw <- cast(melt(DF, id = 1:2), freq ~ gender)

matplot(DFw[,1], DFw[,-1], type = "o", xlab = "freq", ylab = "xBar")


Another possibility, not necessitating conversion to wide format, is xyplot
in the lattice package:

xyplot(xBar ~ freq, DF, group = gender, type = "o", auto.key = TRUE)



On 11/4/06, Sumitrajit Dhar <s-dhar at northwestern.edu> wrote:
> Hi Folks,
>
> I have data that looks like this:
>
> freq            gender          xBar
> 1000    m                       2.32
> 1000    f                       3.22
> 2000    m                       4.32
> 2000    f                       4.53
> 3000    m                       3.21
> 3000    f                       3.44
> 4000    m                       4.11
> 4000    f                       3.99
>
> I want to plot two lines (with symbols) for the two groups "m" and
> "f". I have tried the following:
>
> plot(xBar[gender=="m"]~freq[gender=="f"]) followed by
>
> lines(xBar[gender=="m"]~freq[gender=="f"])
>
> with different symbols and lines colors (which I know how to do).
>
> However, these initial plots are not giving me the right output. The
> initial plot command generates the following error.
> Error in plot.window(xlim, ylim, log, asp, ...) :
>        need finite 'xlim' values
> In addition: Warning messages:
> 1: no non-missing arguments to min; returning Inf
> 2: no non-missing arguments to max; returning -Inf
> 3: no non-missing arguments to min; returning Inf
> 4: no non-missing arguments to max; returning -Inf
>
> A second issue, I would also like to offset the second set of points
> along the x-axis so that the error bars will be visible.
>
> Any help is appreciated.
>
> Regards,
> Sumit
>
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