Re: [R] Step wise regression

From: Ted Harding <Ted.Harding_at_nessie.mcc.ac.uk>
Date: Wed 04 May 2005 - 01:00:10 EST


On 03-May-05 Frank E Harrell Jr wrote:
> walmir-rodrigues wrote:

>> Dear Fellows,
>> 
>> How can I do to proced a step wise regression in R, if itīs possible ?
>> 
>> Thanks,
>> 
>> Walmir 

>
> Here is an easy approach that will yield results only slightly less
> valid than one actually using the response variable:
>
> x <- data.frame(x1,x2,x3,x4,..., other potential predictors)
> x[,sample(ncol(x))]
>
>:-) -Frank

Frank, you are a sneaky subversive! But you have given me a technical clue for a project long near to my heart (with Andy's important "random parsimony" refinement).

This is to implement software-driven Clinical Trials articles, for submission to standard peer-reviewed journals.

The underlying engine would be the dada-engine. For samples of what this can generate, visit

  http://www.elsewhere.org/cgi-bin/postmodern

repeatedly (or click on the "To generate another essay, follow this link" link you will find just below the article generated; repeat ad libitum).

Also at the foot of the page, you will find links to explanations of how it works. See also

  http://dev.null.org/dadaengine/

The basis is that articles of certain kinds have a predictable structure, and utilise terminology, phrases, sentence-structures and substantive elements drawn from typical usage, and are such that the real thing is indistiguishable from the results of sampling these elements at random, under the control of a rulebased recursive transition network automaton.

Tailor-made for Clinical Trials, methinks. (Mind you, someone once did a lot of work setting up the rulebase for the PostModern Lit Crit genre which is what you get in the above samples).

Best wishes,
Ted.



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