bread.Rchoice function

Bread for sandwiches

Computes the ``bread'' of the sandwich covariance matrix for a model of class Rchoice

## S3 method for class 'Rchoice'
bread(x, ...)

Arguments

• x: a fitted model of class Rchoice,
• ...: Other arguments when bread is applied to another class object.

Returns

the covariance matrix times observations

Details

For more information see bread from the package sandwich.

Examples

## Probit model
data("Workmroz")
probit <- Rchoice(lfp ~ k5 + k618 + age + wc + hc + lwg + inc,  
                  data = Workmroz , family = binomial('probit'))
summary(probit)

library("sandwich")
bread(probit)

References

Zeileis A (2006), Object-oriented Computation of Sandwich Estimators. Journal of Statistical Software, 16(9), 1--16.