D. Guegan et Jn. Wandji, POWER OF THE LAGRANGE MULTIPLIER TEST FOR CERTAIN 2ND-ORDER SUB-DIAGONAL BILINEAR MODELS, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 322(2), 1996, pp. 179-184
We use Lagrange multiplier test to discriminate between linear first o
rder autoregressive models and certain second order sub-diagonal model
s, for which we give an invertibility condition. We prove the contigui
ty of a sequence of local alternatives to the null hypothesis. Using L
e Cam's third lemma, we derive an explicit formula for the local theor
etical power of the test.