Abstract
The local number fluctuation which has recently been introduced is discussed from the viewpoint of identical particle effect and kinematical clustering. In frameworks of concrete models, explicit expressions for the fluctuation are given and examined quantitatively as well as qualitatively. It is shown that the recently observed large fluctuation for like pions is naturally explained as identical particle effect. A restriction to number distribution of hadrons in a cluster from the data of local number fluctuation is also pointed out.

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