Sarah - 3 years ago 71

R Question

Simple question really! I am running lots of linear regressions of

`y~x`

`summary.lm`

`m<-lm(Alopecurus.geniculatus~Year)`

> summary(m)

Call:

lm(formula = Alopecurus.geniculatus ~ Year)

Residuals:

Min 1Q Median 3Q Max

-19.374 -8.667 -2.094 9.601 21.832

Coefficients:

Estimate Std. Error t value Pr(>|t|)

(Intercept) 700.3921 302.2936 2.317 0.0275 *

Year -0.2757 0.1530 -1.802 0.0817 .

---

Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 11.45 on 30 degrees of freedom

(15 observations deleted due to missingness)

Multiple R-squared: 0.09762, Adjusted R-squared: 0.06754

F-statistic: 3.246 on 1 and 30 DF, p-value: 0.08168

So I get a Standard Error output and I was hoping to get a Variance output without calculating it by hand...

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Answer Source

I'm not sure what you want the variance of.

If you want the *residual* variance, it's: `(summary(m)$sigma)**2`

.

If you want the variance of your *slope*, it's: `(summary(m)$coefficients[2,2])**2`

, or `vcov(m)[2,2]`

.

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