[R] Extract information from the summary of 'lm'
Jun Ding
dingjun_cn at yahoo.com
Wed Jun 21 04:25:02 CEST 2006
Hi Everyone,
I just don't know how to extract the information I
want from the summary of a linear regression model
fitting.
For example, I fit the following simple linear
regression model:
results = lm(y_var ~ x_var)
summary(results) gives me:
Call:
lm(formula = y_var ~ x_var)
Residuals:
Min 1Q Median 3Q Max
-5.9859 -1.5849 0.4574 2.0163 4.6015
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) -1.7782 0.5948 -2.990 0.004879 **
x_var 2.1237 0.5073 4.187 0.000162 ***
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.'
0.1 ' ' 1
I can get the esitmates (i.e. -1.7782 and 2.1237) of
coefficients by calling
results$coefficients
But I don't know how to get the corresponding t values
and P values for those coefficients. I am running a
lot of regression models and I can not run 'summary'
every time to get the t and P values for each model.
Can anybody give me some hints? Thank you very much!
Best,
Jun
----------------------------
Jun Ding, Ph.D. student
Department of Biostatistics
University of Michigan
Ann Arbor, MI, 48105
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