[R] How to extract estimates, Std. Error, t Value and Pr(>|t|) from summary

[John Kane]

Here is a response some time ago from John Fox which
should help.
================================================

#  Extracting values from various objects.
#  From "John Fox" <jfox at mcmaster.ca>

# Using an anova
 mod <- lm(mpg ~ ., data=mtcars)
 av <- anova(mod)

 names(av)
#[1] "Df"      "Sum Sq"  "Mean Sq" "F value" "Pr(>F)"

 str(av)
#Classes 'anova' and 'data.frame':       11 obs. of  5
variables:
# $ Df     : int  1 1 1 1 1 1 1 1 1 1 ...
# $ Sum Sq : num  817.71  37.59   9.37  16.47  77.48
...
# $ Mean Sq: num  817.71  37.59   9.37  16.47  77.48
...
# $ F value: num  116.42   5.35   1.33   2.34  11.03
...
# $ Pr(>F) : num  5.03e-10 3.09e-02 2.61e-01 1.41e-01
3.24e-03 ...
# - attr(*, "heading")= chr  "Analysis of Variance
Table\n" "Response: mpg"
#
#Thus, e.g., av$"Sum Sq" returns the sums of squares:

 av$"Sum Sq"
# [1] 817.7129524  37.5939529   9.3709293  16.4674349 
77.4757948  3.9493082
# [7]   0.1297687  14.4742372   0.9717105   0.4066688
147.4944300

#You could do the same thing with the object returned
by summary().

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--- Daphne Renault <daphne.renault at yahoo.com> wrote:



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