“…The parameters of the lognormal distribution are the mean log estimated by log x log xi (6) and the variance of the logs estimated as var log x = n-1 2 (log x,. -log x)2 (7) Coliform counts of zero present a problem with the use of the lognormal distribution. One solution is to use the lognormal distribution with added zeros (sometimes called the delta distribution).…”
An examination of the frequency distributions most commonly used to estimate mean coliform densities in flowing water compares their reliability in describing coliform data obtained from sample tests.
“…The parameters of the lognormal distribution are the mean log estimated by log x log xi (6) and the variance of the logs estimated as var log x = n-1 2 (log x,. -log x)2 (7) Coliform counts of zero present a problem with the use of the lognormal distribution. One solution is to use the lognormal distribution with added zeros (sometimes called the delta distribution).…”
An examination of the frequency distributions most commonly used to estimate mean coliform densities in flowing water compares their reliability in describing coliform data obtained from sample tests.
“…lated over the past 10 years in favor of the molecular filter membrane technique (1)(2)(3)(4) . Eliassen (3) emphasizes precision as the major advantage of the MF method.…”
mentioning
confidence: 99%
“…The relative coliform recovery or the ratio of the median MF to the median MPN was 0.92. With adjustment (MPN X 0.81) for bias(2), the relative coli-MF form recovery MPN was 1.13. Overall average.…”
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