[R] help with projection pursuit

[David Winsemius]

In my experience (and per the help pages now that I look) the predict  
functions need named arguments that match up with the column names in  
the model and generally this needs to be supplied as a dataframe or a  
list.

(note: at least on my machine the rock dataframe does *not* have the  
names you offered)

predict(rock.ppr, list(area=10, peri= 3, shape=2))   # or...
predict(rock.ppr, data.frame(area=10, peri= 3, shape=2))

 > predict(rock.ppr, list(area=10, peri= 3, shape=2))
        1
7.118094

-- 
David Winsemius

On Feb 27, 2009, at 10:09 AM, Olivier MARTIN wrote:

> Hi all,
>
> I have some difficulties with the function ppr for projection  
> pursuit regression.
> I obtained the results for a projection pursuit regression and now I  
> would like to
> compute some predictions for new data.
>
> I tried the function predict in the following way predict(res.ppr,  
> newdata) but it seems
> that it is not right. The data rock is given for illustration of the  
> function ppr.
>
> attach(rock)
>
> rock.ppr <- ppr(log(perm) ~ area1 + peri1 + shape, data = rock,  
> nterms = 2, max.terms = 5)
>
>
> So suppose I want to make a prediction for the point
> area1=10,peri1=3 and shape=2. I tried
> the command predict(rock.ppr, c(10,3,2))  but it returns
> an error message.
> So, could you  indicate me the right way for this prediction?
>
> Thanks for your help.
> Olivier.
>
>
> -- 
>
> -------------------------------------------------------------
> Martin Olivier
> INRA - Unité Biostatistique & Processus Spatiaux
> Domaine St Paul, Site Agroparc
> 84914 Avignon Cedex 9, France
> Tel : 04 32 72 21 57
> Fax : 04 32 72 21 82
>
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