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Moderate deviations for martingales with bounded jumps. (English) Zbl 0854.60027
Summary: We prove that the moderate deviation principle (MDP) holds for the trajectory of a locally square integrable martingale with bounded jumps as soon as its quadratic covariation, properly scaled, converges in probability at an exponential rate. A consequence of this MDP is the tightness of the method of bounded martingale differences in the regime of moderate deviations.

##### MSC:
 60F10 Large deviations 60G44 Martingales with continuous parameter 60G42 Martingales with discrete parameter
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