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我试图复制从Stata到R的logit回归.在Stata中我使用选项"robust"来获得强大的标准误差(异方差性一致的标准误差).我能够从Stata中复制完全相同的系数,但是我无法使用"三明治"包具有相同的强大标准误差.

我尝试了一些OLS线性回归的例子; 看起来R和Stata的三明治估算器给了我同样强大的OLS标准误差.有没有人知道Stata如何计算非线性回归的三明治估计量,在我的例子中是logit回归？

谢谢!

附加代码:在R中:

library(sandwich)
library(lmtest)    
mydata <- read.csv("http://www.ats.ucla.edu/stat/data/binary.csv")    
mydata$rank<-factor(mydata$rank)    
myfit<-glm(admit~gre+gpa+rank,data=mydata,family=binomial(link="logit"))    
summary(myfit)    
coeftest(myfit, vcov = sandwich)    
coeftest(myfit, vcov = vcovHC(myfit, "HC0"))    
coeftest(myfit, vcov = vcovHC(myfit))    
coeftest(myfit, vcov = vcovHC(myfit, "HC3"))    
coeftest(myfit, vcov = vcovHC(myfit, "HC1"))    
coeftest(myfit, vcov = vcovHC(myfit, "HC2"))    
coeftest(myfit, vcov = vcovHC(myfit, "HC"))    
coeftest(myfit, vcov = vcovHC(myfit, "const"))    
coeftest(myfit, vcov = vcovHC(myfit, "HC4"))    
coeftest(myfit, vcov = vcovHC(myfit, "HC4m"))    
coeftest(myfit, vcov = vcovHC(myfit, "HC5"))    

塔塔:

use http://www.ats.ucla.edu/stat/stata/dae/binary.dta, clear    
logit admit gre gpa i.rank, robust