-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of David Perlman
Sent: January-14-11 6:37 PM
To: r-help at r-project.org
Subject: [R] Question about scatterplot in package car
I am getting an error message from scatterplot:
library(car)
scatterplot(Prestige$income~Prestige$type)
Error in Summary.factor(c(2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, :
range not meaningful for factors
In addition: Warning message:
In Ops.factor(x[floor(d)], x[ceiling(d)]) : + not meaningful for factors
The command does output the kind of graph that I want (boxplots).
I just did install.packages("car") so I believe I have the latest
version.
More generally, the reason I am trying to do this is because I am trying
to generate a boxplot with case number labels on the outlier points. I
initially tried to do it with the base boxplot() but the returned values
of the outliers do not include enough information to actually identify
which cases those points came from. Scatterplot in car seems like it
should be able to do the trick, but I haven't been able to figure out
how to get it to work.
The following command works as expected:
scatterplot(Prestige$income~Prestige$prestige, id.n=4)
but this command does not label anything:
scatterplot(Prestige$income~Prestige$type, id.n=4) and also produces the
same error.
Furthermore, even if that did work, what I really want is for the points
already identified as outliers to be labeled, but I have not been able
to figure out how to do that. I am not sure if that is because I am
confused, or because scatterplot() isn't working right!
Any help with how to do this would be greatly appreciated. Thanks in
advance!
--
-dave----------------------------------------------------------------
"Pseudo-colored pictures of a person's brain lighting up are undoubtedly
more persuasive than a pattern of squiggles produced by a polygraph.
That could be a big problem if the goal is to get to the truth." -Dr.
Steven Hyman, Harvard