Extension of EMA to address regional skew and low outliers

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Resource Abstract:
The recently developed expected moments algorithm [EMA] (Cohn et al. 1997) does as well as MLEs at estimating LP3 flood quantiles using systematic and historical information. Needed extensions include use of a regional skewness estimator and its precision to be consistent with Bulletin 17B and to make use of such hydrologic information. Another issue addressed by Bulletin 17B is the treatment of low outliers. A Monte Carlo study illustrates the performance of an extended EMA estimator compared to estimators that employ the complete data set with and without use of regional skew, conditional probability adjustment from Bulletin 17B, and an estimator that uses probability plot regression to compute substitute values for low outliers. Estimators that use a regional skew all do better than estimators that fail to use an informative regional skewness estimator. For LP3 data, the low outlier rejection procedure results in no loss of overall accuracy, and the differences between the MSEs of the estimators that used an informative regional skew were generally negligible in the skew range of real interest.
Citation
Title Extension of EMA to address regional skew and low outliers
Publication Date  Date   2003
Topic Category:  geoscientificInformation
Keywords:
Theme keywords (theme):
Hydrology
thesaurus name >
Title Science Domain > Earth Science
publication  Date   2017-01-14
other Citation Details  Cinergi keyword enhanced at Sat Jan 14 11:46:15 UTC 2017
Theme keywords (theme):
Flood
thesaurus name >
Title Process > Hydrologic Process
publication  Date   2017-01-14
other Citation Details  Cinergi keyword enhanced at Sat Jan 14 11:46:15 UTC 2017
Resource language:  eng
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URL: https://www.sciencebase.gov/catalog/item/505a0e43e4b0c8380cd53390
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URL: http://pubs.er.usgs.gov/publication/70025349
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URL: https://www.sciencebase.gov/catalog/file/get/505a0e43e4b0c8380cd53390
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Metadata data stamp:  2014-07-21T18:15:53Z
Metadata Constraints
Constraints
Use limitation statement:
none
Metadata contact - author
organisation Name  Griffis, V. W.
Contact information
Metadata contact - author
organisation Name  Stedinger, J. R.
Contact information
Metadata contact - author
organisation Name  Cohn, T. A.
Contact information
Metadata contact - pointOfContact
organisation Name  Bizier P.DeBarry P.
Contact information
Metadata scope code  dataset
Metadata language  eng USA
Metadata character set encoding:   utf8
Metadata standard for this record:  ISO19115
standard version:  1.0
Metadata record identifier:  505a0e43e4b0c8380cd53390
URI for dataset described: > https://www.sciencebase.gov/catalog/item/505a0e43e4b0c8380cd53390

Metadata record format is ISO19139-2 XML (MI_Metadata)