It works!!!
Thanks a lot Chuck!
-----Original Message-----
From: Chuck Cleland [mailto:[EMAIL PROTECTED]
Sent: Monday, 10 March 2008 11:29 PM
To: Elena Wilson
Cc: r-help@r-project.org
Subject: Re: [R] Weighting data when running regressions
On 3/10/2008 7:49 AM, Elena Wilson wrote:
> Dear R-Help,
>
> I'm new to R and struggling with weighting data when I run regression.
I've
> tried to use search to solve my problem but haven't found anything helpful
> so far.
>
> I (successfully) import data from SPSS (15) and try to run a linear
> regression on a subset of my data file where WEIGHT is the name of my
> weighting variable (numeric), e.g.:
>
> library(foreign)
>
> data1=read.spss("File.sav", use.value.labels = FALSE, to.data.frame =
TRUE)
>
> summary(data1) ' shows me all the variables OK
>
> attach(data1)
>
> linmod=lm(Y~X1+X2+X3+X4W, subset=(X5==1 & X6==7), weights==WEIGHT)
>
> and I get the following Error message:
>
> Error in weights == WEIGHT :
>
> comparison (1) is possible only for atomic and list types
>
> It works perfectly if I don't use the ", weights==WEIGHT" bit
Try it with just one equals sign after weights:
linmod=lm(Y~X1+X2+X3+X4W, subset=(X5==1 & X6==7), weights=WEIGHT)
> Could you please let me know what I am doing wrong?
>
> Thank you in advance,
>
> Lena
>
> [[alternative HTML version deleted]]
>
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--
Chuck Cleland, Ph.D.
NDRI, Inc.
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