The local asymptotic normality property is established for a
regression model with fractional ARIMA($p, d, q$) errors. This result allows
for solving, in an asymptotically optimal way, a variety of inference problems
in the long-memory context: hypothesis testing, discriminant analysis,
rank-based testing, locally asymptotically minimax andadaptive estimation, etc.
The problem of testing linear constraints on the parameters, the discriminant
analysis problem, and the construction of locally asymptotically minimax
adaptive estimators are treated in some detail.