Estimating Percentiles from Environmental Samples when all Observations are Nondetectable.
DESMATICS INC STATE COLLEGE PA
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Many environmental sampling problems involve some specified regulatory or contractual limit RL. Often the interest is in estimating the percentile of the underlying contaminant concentration distribution corresponding to RL. In previous reports, we have discussed the problem of determining a lower 1001-alpha confidence limit for that percentile when no observations are observable, but are all known to be less than DL, where DL is less than RL. In this report we extend those results to the situation in which more than a single detection limit is involved.
- Statistics and Probability