Abstract
Tho usefulness of rociprocal coordinate subtancent as a measure on the density curve of a life distribution bas been pointed out through teveral results including some characterizations and classifications. Existing nonparametric classifications based on failure rate and avorage failure rate have been related to the nonparametric classifications proposed here. It bas also been sbown tbat a study through reciprocal coordinate subtangent results in more aeneral properties from which properties of extistiog classes can bo obtained as a special case.
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