yihui
对于回归而言，如果系数足够显著，那么summary()的结果会显示星号的。
> x=runif(100);y=x+rnorm(100,,.1)
> summary(lm(y~x))
Call:
lm(formula = y ~ x)
Residuals:
Min 1Q Median 3Q Max
-0.1926327 -0.0759486 -0.0005249 0.0613208 0.2263020
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) -0.01885 0.01992 -0.946 0.346
x 1.02392 0.03452 29.665 <2e-16 ***
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
Residual standard error: 0.09924 on 98 degrees of freedom
Multiple R-squared: 0.8998, Adjusted R-squared: 0.8988
F-statistic: 880 on 1 and 98 DF, p-value: < 2.2e-16
