[R] retrieving p-values in lm

From: Patrick Kuss <Patrick.Kuss_at_unibas.ch>
Date: Sat 10 Dec 2005 - 00:19:33 EST


Dear list,

I want to retrieve the p-value of a two-polynomial regression. For a one-polynomial lm I can easily do this with: summary(lm(b~a, data=c)[[4]][[8]].

But how do I find the final p-value in the two-polynomial regression? Under $coefficients I don't find it

Any suggestions?

Patrick

alt <-(2260,2183,2189,1930,2435,

2000,2100,2050,2020,2470,
1700,2310,2090,1560,2060,
1790,1940,2100,2250,2010)

H <- c(0.2034,0.1845,0.2053,0.1788,0.2196,
0.2037,0.1655,0.2176,0.1844,0.2033,

0.1393,0.2019,0.1975,0.1490,0.1917,
0.2180,0.2064,0.1943,0.2139,0.1320)

X <- data.frame(alt,H)

lm.res <- summary(lm(H~alt,data=X))
lm.res
p1 <- lm.res[[4]][[8]]
p1

lm.res.2 <- summary(lm(H~alt+I(alt^2),data=X))
lm.res.2
str(lm.res.2) # where is p

p2 <- lm.res.2[[???]][[????]]

--
Patrick Kuss
PhD-student
Institute of Botany
University of Basel
Schönbeinstr. 6
CH-4056 Basel
+41 61 267 2976

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Received on Sat Dec 10 00:26:50 2005

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