R help - May 2008 - How to extract estimates, Std. Error, t Value and Pr(>|t|) from summary

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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().

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



      __________________________________________________________________
[[elided Yahoo spam]]

> dat<-array(runif(30),c(15,2));
> dat<-data.frame(x=dat[,1],y=dat[,2]);
> linm<-lm(y~x,data=dat);
> linm.s<-summary(linm);
> attributes(linm.s) #to see all attributes of the summary
$names
 [1] "call"          "terms"         "residuals"  
"coefficients"
 [5] "aliased"       "sigma"         "df"         
"r.squared"
 [9] "adj.r.squared" "fstatistic"   
"cov.unscaled"

$class
[1] "summary.lm"
> linm.s$coefficients # that's the variable you're looking for,
right?
              Estimate Std. Error   t value    Pr(>|t|)
(Intercept)  0.6132455  0.1907463  3.214980 0.006769529
x           -0.3648345  0.3134967 -1.163759 0.265436835


thanks
y




Daphne Renault wrote:
> 
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

-----
Yasir H. Kaheil
Catchment Research Facility
The University of Western Ontario 

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