Journal of Applied Probability
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On the study of the running maximum and minimum level of level-dependent quasi-birth–death processes and related models

Publication Date Sep 19, 2022

Abstract

Abstract We present a study of the joint distribution of both the state of a level-dependent quasi-birth–death (QBD) process and its associated running maximum level, at a fixed time t: more specifically, we derive expressions for the Laplace transforms of transition functions that contain this information, and the expressions we derive contain familiar constructs from the classical theory of QBD processes. Indeed, one important takeaway from our results is that the distribution of the running maximum level of a level-dependent QBD process can be studied using results that are highly analogous to the more well-established theory of level-dependent QBD processes that focuses primarily on the joint distribution of the level and phase. We also explain how our methods naturally extend to the study of level-dependent Markov processes of M/G/1 type, if we instead keep track of the running minimum level instead of the running maximum level.

Concepts

Quasi-birth–death Processes Familiar Constructs Quasi-birth–death Theory Of Processes Death Process Minimum Level Maximum Level Joint Distribution Classical Theory Markov Processes

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