R help - Mar 2008 - Weighting data when running regressions

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

 

 

Could you please let me know what I am doing wrong? 

 

Thank you in advance, 

Lena

 

 

 

 


	[[alternative HTML version deleted]]

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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On Mar 10, 2008, at 7:49 AM, Elena Wilson wrote:
>
> linmod=lm(Y~X1+X2+X3+X4W, subset=(X5==1 & X6==7), weights==WEIGHT)
That should likely be weights=WEIGHT, with one equal sign.

Haris Skiadas
Department of Mathematics and Computer Science
Hanover College

It works!!!
Thanks a lot Haris!

-----Original Message-----
From: Charilaos Skiadas [mailto:cskiadas at gmail.com] 
Sent: Monday, 10 March 2008 11:30 PM
To: Elena Wilson
Cc: r-help at r-project.org
Subject: Re: [R] Weighting data when running regressions

On Mar 10, 2008, at 7:49 AM, Elena Wilson wrote:
>
> linmod=lm(Y~X1+X2+X3+X4W, subset=(X5==1 & X6==7), weights==WEIGHT)
That should likely be weights=WEIGHT, with one equal sign.

Haris Skiadas
Department of Mathematics and Computer Science
Hanover College