R help - Nov 2006 - Using lrm

Hi,

I have to build a logistic regression model on a data set that I have. I
have three input variables (x1, x2, x3) and one output variable (y).

The syntax of lrm function looks like this

     lrm(formula, data, subset, na.action=na.delete, method="lrm.fit",
         model=FALSE, x=FALSE, y=FALSE, linear.predictors=TRUE, se.fit=FALSE,

         penalty=0, penalty.matrix, tol=1e-7,
         strata.penalty=0, var.penalty=c('simple','sandwich'),
         weights, normwt, ...)

Any logistic regression model would take y and x1,x2,x3 as parameters and
output the model (probabilities). So, I dont know where to fit in these
values in this function.

Any help is appreciated. I am chasing a deadline in my project.

Nitin

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Hello Nitin,

if you examine the help information for lrm carefully, at the bottom
you will find numerous examples that you can follow.

?lrm

By the way, asking a queestion like this it's best to clarify if you
mean the lrm from the Design package or some other one.  I assume it's
from Design, as the syntax you quote is a good match.

It's also best to study the help files carefully.

Andrew

On Mon, Nov 13, 2006 at 11:01:59PM -0600, nitin jindal
wrote:
> Hi,
> 
> I have to build a logistic regression model on a data set that I have. I
> have three input variables (x1, x2, x3) and one output variable (y).
> 
> The syntax of lrm function looks like this
> 
>      lrm(formula, data, subset, na.action=na.delete,
method="lrm.fit",
>          model=FALSE, x=FALSE, y=FALSE, linear.predictors=TRUE,
se.fit=FALSE,
> 
>          penalty=0, penalty.matrix, tol=1e-7,
>          strata.penalty=0,
var.penalty=c('simple','sandwich'),
>          weights, normwt, ...)
> 
> Any logistic regression model would take y and x1,x2,x3 as parameters and
> output the model (probabilities). So, I dont know where to fit in these
> values in this function.
> 
> Any help is appreciated. I am chasing a deadline in my project.
> 
> Nitin
> 
> 	[[alternative HTML version deleted]]
> 
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-- 
Andrew Robinson  
Department of Mathematics and Statistics            Tel: +61-3-8344-9763
University of Melbourne, VIC 3010 Australia         Fax: +61-3-8344-4599
http://www.ms.unimelb.edu.au/~andrewpr
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