Nothing
print.heckitrob <-
function(x, digits = 4, ...)
{
cat("Call: \n")
print(x$call)
cat(" \n")
cat("Coefficients (selection equation): \n")
print(x$stage1$coeff, digits = 4)
cat("Coefficients (outcome equation): \n")
print(x$stage2$coeff, digits = 4)
}
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