[S] Fw: difference between predict

alain Le Tertre (alain@worldnet.fr)
Tue, 25 Aug 1998 10:34:05 +0200


I have received some e-mail from people who need the answer, but no answer,
even from s-help.
So, i'll resend my question.
-----Original Message-----
From: alain Le Tertre <alain@worldnet.fr>
To: s-news <s-news@wubios.wustl.edu>
Date: mercredi 29 juillet 1998 10:24
Subject: difference between predict

>In S-plus 4 guide to statistics p 221, "Specifying type="terms" allows you
>to compute the component of the prediction for each term separately.
Summing
>the columns of the matrix and adding the constant (intercept) term is
>equivalent to specifying type="link"".
>So try :
>zzz_gam(Kyphosis ~ poly(Age, 2) + s(Start), data = kyphosis)
>cbind(predict(zzz,type="link"),zzz$coef[1]+rowSums(predict(zzz,type="terms"
)
>))
>give you :
>1 1.6582944 2.059893
> 2 1.1161389 1.517737
> 3 1.6671144 2.068713
> 4 1.1938420 1.595441
> 5 0.8517588 1.253357
> 6 0.8213737 1.222972
> 7 1.0687632 1.470362
> 8 1.0036325 1.405231
> 9 1.1289169 1.530515
>10 1.2703754 1.671974
>11 1.1993687 1.600967
>[snip]
>Did i misunderstand something?
>
>I'm using S-plus 4.0 release 3 on w95.
>
>
> O__ ---- Alain Le Tertre
> c/ /'_ --- Réseau National de Santé Publique (RNSP)
>(*) \(*) -- 12 rue du val d'Osne
>~~~~~~~~~~ - 94415 Saint Maurice cedex FRANCE
>Voice: 33 1 41 79 67 50 Fax: 33 1 41 79 67 68
>email: alain@worldnet.fr
>

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