On 09/02/2008 11:38 AM, David Winsemius wrote: > "Alexander Ovodenko" <[EMAIL PROTECTED]> wrote in > news:[EMAIL PROTECTED]: > >> Thanks for the replies to my prior question. My problem is that R >> always says object not found when I enter a variable name into a >> command. I converted a Stata file into an Rdata file by first >> loading the foreign package by entering >> >> require(foreign) >> >> Then I asked R to read the Stata file by entering >> >> pol572a1<- read.dta("C:\\alex\\Graduate Coursework\\Pol >> 572\\pol572a1.dta") > > At this point you should type str(pol572a1) to make sure <everything> > is the dataframe named pol572a1. > >> So now I can do a few things with the data, but I am only able to do >> so by entering >> >> with(pol572a1, >> >> before typing another command. So I enter the following for a >> scatter plot: with(pol572a1, plot(rgnpc, incmean)) > > If you wanted to avoid the with() function (but why would you?) you > could have used: > > plot(pol572a1$rgnpc, pol572a1$incmean) > >> When I run a simple linear regression, I enter the following: >> with(pol572a1, lm(incmean~rgnpc)) > > Which creates the model and immediately discards it, because no durable > object was given the values: > >> But when try to get a fitted line, I enter the following: >> with(pol572a1, lm( share.gnp)<-lm(incmean~rgnpc)) > > That does not look particular sensible. Assuming that the goal was to > create a model object named share.gnp, then try instead: > > with(pol572a1, share.gnp.mdl <-lm(incmean~rgnpc) )
That won't work: share.gnp.mdl will be created in the local environment created by with(), and then discarded. You need to put it outside, i.e. share.gnp.mdl <- with(pol572a1, lm(incmean~rgnpc) ) Duncan Murdoch > > (My practice is to label my models, but it is not necessary.) > > Then look at share.gnp.mdl with str() and you should see fitted.values. > You could then plot() the fitted values and the observed values. > > >> But I get the >> following error message: Error in lm(share.gnp) <- lm(incmean ~ >> rgnpc) : object "share.gnp" not found >> >> So what should I do to get R to read the dataframe in the ordinary >> way with the usual command? > > I cannot tell what you mean. It appears you already have the data in a > dataframe. > >> I am willing to scrap this dataframe >> and use the original Stata file to start over, as long as that >> resolves the problem. >> >> Thanks! >> >> Alex >> > > ______________________________________________ > R-help@r-project.org 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@r-project.org 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.
