The levinlin package of Baum and Bornhorst (Levin-Lin-Chu panel unit
root test) has been updated on the SSC Archive. Claudio E. Raddatz
helpfully pointed out an error in our error-handling logic. It did
not affect the computations, but could sometimes prevent the routine
from presenting results. That has been fixed. The updated routine can
be downloaded via ssc install levinlin, replace
