Problem with tF critical values (from Lee et al.(2022))

[Zeynep Yilmaz]

I attempt to replicate the example, accessible in "help tf" in the Stata menu. But i receive "invalid syntax error r(198)" and i am using Stata 15.1. Any help would be appreciated, thank you in advance.

ssc install ranktest
ssc install ivreg2
net install tf, force from(http://www.princeton.edu/~davidlee/wp/)

use http://fmwww.bc.edu/ec-p/data/hayashi/griliches76.dta
xi i.year
tf lw s expr tenure rns smsa _I* (iq=med)

Res.:

. use http://fmwww.bc.edu/ec-p/data/hayashi/griliches76.dta
(Wages of Very Young Men, Zvi Griliches, J.Pol.Ec. 1976)
 
. xi i.year
i.year            _Iyear_66-73        (naturally coded; _Iyear_66 omitted)

. tf lw s expr tenure rns smsa _I* (iq=med)
invalid syntax
r(198);

[Zeynep Yilmaz]

I switched to Stata 16 and it works!