Based on the estimatorsŝ j 's, an estimatorF M ðtÞ of F 0 (t) can be uniquely defined for t 2 ½p j ,q j þ 1 Þ byF M ðp j Þ 1 F M ðq j þ 1 ÀÞ ¼ŝ 1 þ Á Á Á þŝ j , but is not uniquely defined for t being in an open innermost interval (q j ,p j ) with q j o p j .