[R] weight

[John Kane]

--- Douglas Bates <bates at stat.wisc.edu> wrote:

> On 4/28/07, John Kane <jrkrideau at yahoo.ca> wrote:
> > IIRC you have a yes/no smoking variable scored 1/2
> ?
> >
> > It is possibly being read in as a factor not as an
> > integer.
> >
> > try
> >  class(df$smoking.variable)
> > to see .
> 
> Good point.  In general I would recommend using
> 
> str(df)
> 
> to check on the class or storage type of all
> variables in a data frame
> if you are getting unexpected results when
> manipulating it.  That
> function is carefully written to provide a maximum
> of information in a
> minimum of space.

Yes but I'm an relative newbie at R and didn't realise
that str() would do that.  I always thought it was
some kind of string function.  

Thanks, it makes life much easier.

> >
> > --- Natalie O'Toole <notoole at mtroyal.ca> wrote:
> >
> > > Hi,
> > >
> > > I'm getting an error message:
> > >
> > > Error in df[, 1:4] * df[, 5] : non-numeric
> argument
> > > to binary operator
> > > In addition: Warning message:
> > > Incompatible methods ("Ops.data.frame",
> > > "Ops.factor") for "*"
> > >
> > > here is my code:
> > >
> > >
> > > ##reading in the file
> > > happyguys<-read.table("c:/test4.dat",
> header=TRUE,
> > > row.names=1)
> > >
> > > ##subset the file based on Select If
> > >
> > > test<-subset(happyguys, PROV==48 & GRADE == 7  &
> > > Y_Q10A < 9)
> > >
> > > ##sorting the file
> > >
> > > mydata<-test
> > > mydataSorted<-mydata[ order(mydata$Y_Q10A), ]
> > > print(mydataSorted)
> > >
> > >
> > > ##assigning  a different name to file
> > >
> > > happyguys<-mydataSorted
> > >
> > >
> > > ##trying to weight my data
> > >
> > > data.frame<-happyguys
> > > df<-data.frame
> > > df1<-df[, 1:4] * df[, 5]
> > >
> > > ##getting error message here??
> > >
> > > Error in df[, 1:4] * df[, 5] : non-numeric
> argument
> > > to binary operator
> > > In addition: Warning message:
> > > Incompatible methods ("Ops.data.frame",
> > > "Ops.factor") for "*"
> > >
> > > Does anyone know what this error message means?
> > >
> > > I've been reviewing R code all day & getting
> more
> > > familiar with it
> > >
> > > Thanks,
> > >
> > > Nat
> > >
> >
> > >
> >
>
------------------------------------------------------------------------------------------------------------------------
> > >
> > >
> > > This communication is intended for the use of
> the
> > > recipient to which it is
> > > addressed, and may
> > > contain confidential, personal, and or
> privileged
> > > information. Please
> > > contact the sender
> > > immediately if you are not the intended
> recipient of
> > > this communication,
> > > and do not copy,
> > > distribute, or take action relying on it. Any
> > > communication received in
> > > error, or subsequent
> > > reply, should be deleted or destroyed.
> > >       [[alternative HTML version deleted]]
> > >
> > > ______________________________________________
> > > R-help at stat.math.ethz.ch mailing list
> > > https://stat.ethz.ch/mailman/listinfo/r-help
> > > PLEASE do read the posting guide
> > > http://www.R-project.org/posting-guide.html
> > > and provide commented, minimal, self-contained,
> > > reproducible code.
> > >
> >
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained,
> reproducible code.
> >
>