You are not logged in. You can browse but not post. Login or Register by clicking 'Login or Register' at the top-right of this page. For more information on Statalist, see the FAQ.
Gabriele:
welcome to the Stata forum.
Queries posted in Sandbox are often left unreplied (see the FAQ on the features/subjects of the different forums).
Please re-post on the General forum and provide full references (as per FAQ again). Thanks.
Comment