Mathematics – Probability
Scientific paper
2011-01-25
Mathematics
Probability
To appear in Metrika
Scientific paper
10.1007/s00184-011-0350-z
We characterize the exponential distribution as the only one which satisfies a regression condition. This condition involves the regression function of a fixed record value given two other record values, one of them being previous and the other next to the fixed record value, and none of them are adjacent. In particular, it turns out that the underlying distribution is exponential if and only if given the first and last record values, the expected value of the median in a sample of record values equals the sample midrange.
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