R/dLambdadSM.R

In ssmrob: Robust Estimation and Inference in Sample Selection Models

Defines functions dLambdadSM

Documented in dLambdadSM

dLambdadSM <-
function(x, beta)  # for variance estimation	
{
  (-pnorm(t(x)%*%beta)*dnorm(t(x)%*%beta)*(t(x)%*%beta)-
    dnorm(t(x)%*%beta)^2)/pnorm(t(x)%*%beta)/pnorm(t(x)%*%beta)
}

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