[R] R-help: beginner question
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Thu Aug 28 16:40:28 CEST 2003
"Monica Palaseanu-Lovejoy" <monica.palaseanu-lovejoy at stud.man.ac.uk> writes:
> I am a beginner user of R. I have a trivial question I am almost
> ashamed I cannot figure it out does not matter how many times I
> am reading the help.
> I have a table in .txt format, tab delimited. I can read it with
> read.delim() with no problems.
> Afterwards I would like to use boxplot function to see if there
> are any outliers in the column 5 of my data called TPAH16.ppm
> In the boxplot help I saw that I have to declare my data with
> data(). I am getting errors does not matter how I am calling
> data(), only with the name of the table, with
> data(read.delim()), or in any other way. So in the end I was not
> able to use boxplot at all.
> I will appreciate any help for dummies you can give me. Also,
> if you know any other way to identify outliers, or to use Cook
> dimension to identify them, I will really appreciate.
You don't need data() that's just to get some standard data for the
boxplot() example. What you need is
mydata <- read.delim(...whatever...)
boxplot(V5) # or whatever col.5 is called
(Almost all the boxplot examples appear to be using the formula interface,
which doesn't work without a grouping variable, and only the formula
interface allows you to give a data= argument to boxplot(). At least
one of those should probably be fixed.)
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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