# Wald tests when restrictions are locally singular ∗ 

Jean-Marie Dufour † Eric Renault ‡ 

Victoria Zinde-Walsh § 

December 3, 2013 

Key words :nonlinear restriction; deficient rank; singular covariance ma- trix; Wald test ; nonstandard asymptotic theory; bound. Journal of Eco- nomic Literature classification: C3. 

