Name confusion: Heckman or Heckit

[Ann Ng]

Hello everyone,
Regarding the Heckman two-step selection model for sample selection problem, Wooldridge (2010) says that the two step procedure (1st step:probit, 2nd step: OLS) for Heckman sample selection model is sometimes called Heckit. The heckman command in Stata allows for different options such as twostep, mle. If I use the heckman, can I say that I am using Heckit? If not, what is the options with heckman command for Heckit?
Thank you!
A,

[Andrew Musau]

heckit never caught on! You initially had probit, then James Tobin suggested a censored regression model which came to be referred as Tobin's Probit, or more famously tobit. Because Heckman's procedure includes a first stage probit and is also related to the tobit, some referred to it as heckit. So by all means, call the two-step precedure heckit.