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}
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}
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\seealso{
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\seealso{
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  \code{\link{ppr}}, \code{\link{par}}
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  \code{\link{ppr}}, \code{\link{par}}
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}
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}
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\examples{
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\examples{
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data(rock)
 - 
 
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attach(rock)
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attach(rock)
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area1 <- area/10000; peri1 <- peri/10000
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area1 <- area/10000; peri1 <- peri/10000
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par(mfrow=c(3,2))# maybe: , pty="s")
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par(mfrow=c(3,2))# maybe: , pty="s")
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rock.ppr <- ppr(log(perm) ~ area1 + peri1 + shape,
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rock.ppr <- ppr(log(perm) ~ area1 + peri1 + shape,
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                data = rock, nterms = 2, max.terms = 5)
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                data = rock, nterms = 2, max.terms = 5)