Hi John,

I figured out the skipping of variables using a first subset & then making 
a second subset & it worked!

Thanks,

Natalie

__________________

You need to have a look at Chapter 5 of the Intro to
R.   I would recommend downloading the pdf and
printing it out.  It is not an easy read but it should
help.

newdata <- mydata[, c(PUMDID, Y_Q10A)]

or
newdata <- mydata[, c(1,33)]

should do the trick

--- Natalie O'Toole <notoole@mtroyal.ca> wrote:

> Hi,
>
> Does anyone know how to skip variables (or columns)
> in R. Say, for example
> i had PUMFID position1 and Y_Q10A position 33 and i
> do not want to include
> all the variables in between. Is there a way to do
> this in R when you are
> extracting variables from a large .txt file with
> many, many variables?
>
> Thanks,
>
> Nat
>
> __________________
>
>
> Yes but I believe it will vary depending on what
> package you're using.  I don't deal with weigthed
> data
> so I'm not a good source
>
> Have a look at help for something like lm in the
> stats
>   package (part of the base installation) for an
> example.
>
> ?lm
>
> weight is the fourth argument down.
>
> However for more information try
> http://finzi.psych.upenn.edu/search.html and type in
> weight.
>
> As Brian Ripley says in a reply to a question about
> weights:
>  "Almost all methods I know of do: logistic
> regression, neural nets, classification trees, PPR
> .... "
>
>
> --- Natalie O'Toole <notoole@mtroyal.ca> wrote:
>
> > Hi,
> >
> > Thank-you for the response!! That worked great!!
> Is
> > there any way to apply
> > a weight variable to your file similar to what you
> > can do in SPSS? So that
> > all of your other variables will be weighted by
> the
> > weight variable?
> >
> > Thanks,
> >
> > Nat
> >
> > __________________
> >
> >
> > Hi,
> >
> > i am trying to read a .txt file, do a couple of
> > select if statements on my
> > data, and then finally use the ?table function to
> > get frequency counts on
> > the data. Specifically, i am looking at answering
> > the following question:
> >
> > What is the frequency of Grade 7 students in the
> > province of Alberta who
> > are smokers?
> >
> > I am having some problems:
> >
> > 1)i cannot get the column names to show up when
> > print to screen
> >
> > 2)I cannot seem to skip variables properly when i
> > choose certain other
> > variables
> >
> > 3)i cannot get the combination of Select If
> > statements to work to produce
> > a different table with my new criteria
> >
> > Here are the variables
> >
> > PUMFID position1 length 5
> > PROV position 6 length 2
> > GRADE position 9 length 2
> > Y_Q10A position 33 length 1
> >
> >
> > Y_Q10A has the following 1=yes
> >                            2=no
> >                           9=skip
> >
> > all the others have no skipped or missing values
> >
> > Here is my code:
> >
> > myfile<-("c:/test2.txt")
> >
> myVariableNames<-c("PUMFID","PROV","GRADE","Y_Q10A")
> >
> > myVariableWidths<-c(5,2,2,1)
> >
> >
> >  mydata<-read.fwf(
> > file=myfile,
> > width=myVariableWidths,
> > col.names=myVariableNames,
> > row.names="PUMFID",
> > fill=TRUE,
> > strip.white=TRUE)
> >
> >
> > print(mydata)
> >
> > print( mydata [which(PROV=="AB" & GRADE==7 &
> > Y_Q10A<9), ] )
> >
> >
> >
> > Any help would be greatly appreciated!!
> >
> > Thank-you,
> >
> > Nat
> >
> >
>
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