Examples for 'sandwich::bread'

Bread for Sandwiches

Aliases: bread bread.default bread.lm bread.mlm bread.survreg bread.coxph bread.gam bread.nls bread.rlm bread.hurdle bread.zeroinfl bread.mlogit bread.polr bread.clm

Keywords: regression

### ** Examples

## linear regression
x <- sin(1:10)
y <- rnorm(10)
fm <- lm(y ~ x)

## bread: n * (x'x)^{-1}
bread(fm)

            (Intercept)          x
(Intercept)   1.0414689 -0.2938577
x            -0.2938577  2.0823419

solve(crossprod(cbind(1, x))) * 10

                      x
   1.0414689 -0.2938577
x -0.2938577  2.0823419
[Package sandwich version 3.0-1 Index]