nif:isString
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The probability that a change to an item not represented in memory is correctly detected is therefore (1−rk)+rkt The hit rate is therefore given by H=kN(r+(d−2)(1−r)d−1+1−rd−1(1−rk−1)+1−rd−1rk−1t)+N−kN(1−rk+rkt) Where a change is perceived, the identity of the changed item is guessed at from the set of items perceived to have changed.
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