| Abstract: | This report presents the mathematical expressions and the computational techniques required to compute maximum-likelihood estimates for the parameters of the National Descriptive Model of Mercury in Fish (NDMMF), a statistical model used to predict the concentration of methylmercury in fish tissue. The expressions and techniques reported here were prepared to support the development of custom software capable of computing NDMMF parameter estimates more quickly and using less computer memory than is currently possible with available general-purpose statistical software. Computation of maximum-likelihood estimates for the NDMMF by numerical solution of a system of simultaneous equations through repeated Newton-Raphson iterations is described. This report explains the derivation of the mathematical expressions required for computational parameter estimation in sufficient detail to facilitate future derivations for any revised versions of the NDMMF that may be developed. |
| Genre: | USGS Numbered Series |
| ProdID: | 70041804 |
| Citation Author: | Donato, David I. |
| Citation Contributing Office: | South Florida Information Access |
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| Citation Language: | English |
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| Citation Number Of Pages: | 21 |
| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | Report: iii, 16 p.; Appendix |
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| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 2012-1181 |
| Citation Search Results Text: | Computing maximum-likelihood estimates for parameters of the National Descriptive Model of Mercury in Fish; 2012; OFR; 2012-1181; Donato, David I. |
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| Citation Year: | 2012 |
| Type: | citation/reference |
| Text: | Computing maximum-likelihood estimates for parameters of the National Descriptive Model of Mercury in Fish; 2012; OFR; 2012-1181; Donato, David I. |
| URL (APPENDIX): | http://pubs.usgs.gov/of/2012/1181/mlendm97lc-c.txt |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/2012/1181/pdf/ofr2012-1181_report_508_rev121312.pdf |
| URL (INDEX PAGE): | http://pubs.usgs.gov/of/2012/1181/ |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/ofr_2012_1181.gif |
| Date Other: | Fri, 14 Dec 2012 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
