Hi there,
I am using Stata 13.
I am trying to estimate the Hurdle Poisson model marginal effects. The author of "Health Econometrics Using STATA" estimates the two parts of the model and then uses suest followed by a series of local macros followed by margins to estimate the marginal effects. I am following his method and it seems I am running into an error that I can't figure out.
Here's my code:
Code:
.
local probit "invprobit(predict(eq(h1_AM0)))"
local ey "exp(predict(eq(h2_AW2))) "
local pygt0 "poissontail (exp(predict(eq(h2_AW2))),1)"
margins, dydx(*) expression("`probit'*`ey'/`pygt0'")
However, I got this error: Warning: cannot perform check for estimable functions.
unknown function *exp()
r(133);
Can you help?
I am using Stata 13.
I am trying to estimate the Hurdle Poisson model marginal effects. The author of "Health Econometrics Using STATA" estimates the two parts of the model and then uses suest followed by a series of local macros followed by margins to estimate the marginal effects. I am following his method and it seems I am running into an error that I can't figure out.
Here's my code:
Code:
.
local probit "invprobit(predict(eq(h1_AM0)))"
local ey "exp(predict(eq(h2_AW2))) "
local pygt0 "poissontail (exp(predict(eq(h2_AW2))),1)"
margins, dydx(*) expression("`probit'*`ey'/`pygt0'")
However, I got this error: Warning: cannot perform check for estimable functions.
unknown function *exp()
r(133);
Can you help?
