On 09/02/2008 11:37 AM, ONKELINX, Thierry wrote:
Alexander,
Learn to use the data argument. E.g.
plot(rgnpc, incmean, data = pol572a1)
That won't work. The data arg to plot (and most other functions that
have one) requires a formula, not a simple specification of x and y.
You'd need
plot(incmean ~ rgnpc, data = po1572a1)
(The reason for this limitation is that plot needs to evaluate its first
argument to know what method to call. It can evaluate the formula
incmean ~ rgnpc, but can't evaluate the nonexistent rgnpc.
Duncan Murdoch
Model - lm(incmean ~ rgnpc, data = pol572a1)
to get the fitted values:
Model$fitted
HTH,
Thierry
PS It seems to me that you might want to read a good introduction into
R.
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
[EMAIL PROTECTED]
www.inbo.be
Do not put your faith in what statistics say until you have carefully
considered what they do not say. ~William W. Watt
A statistical analysis, properly conducted, is a delicate dissection of
uncertainties, a surgery of suppositions. ~M.J.Moroney
-Oorspronkelijk bericht-
Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Namens Alexander Ovodenko
Verzonden: zaterdag 9 februari 2008 17:23
Aan: r-help@r-project.org
Onderwerp: [R] R is not reading(?) my data properly
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)
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))
When I run a simple linear regression, I enter the following:
with(pol572a1,
lm(incmean~rgnpc))
But when try to get a fitted line, I enter the following: with(pol572a1,
lm(
share.gnp)-lm(incmean~rgnpc)) 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 am willing to scrap this dataframe and use the
original Stata file to start over, as long as that resolves the problem.
Thanks!
Alex
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