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Quantitative Fisheries - Stock Assessment Model - Woods Hole, MA or Telework

Company: Ocean Associates, Inc.
Location: Mattapoisett
Posted on: April 10, 2021

Job Description:

TO APPLY VISIT: https://workforcenow.adp.com/mascsr/default/mdf/recruitment/recruitment.html?cid=9a93435d-91d4-4a65-8a21-2de9187df1dd&ccId=19000101_000001&jobId=401800&source=CC2&lang=en_US OAI is seeking a postdoctoral scientist to develop diagnostic tools for evaluating state-space stock assessment models. Although state-space assessment models have become increasingly popular in recent years, there are open questions regarding whether traditionally-used stock assessment model diagnostics (such as retrospective error, model residuals, etc.) are reliable indicators of model performance in state-space models. The research project will use an established operating model to generate simulated stock assessment datasets and test a variety of commonly-used and newly-developed diagnostic metrics. The goal will be to determine which diagnostics perform best at identifying the model with the lowest estimation error. The postdoctoral scientist will have the opportunity to develop their own diagnostic tests and apply the methods to real datasets, which will inform the 2023 State-space Assessment Methods Research Track. State-space models have the ability to include many unobserved processes (e.g., survival, catch misreporting, recruitment stanzas) which can greatly increase model fit at the cost of only 1-2 additional parameters. Consequently, commonly-used diagnostic tools (e.g., model residuals) and model selection criteria (e.g., AIC, likelihood ratio tests) have been shown to be unreliable because they do not take into account the high degree of flexibility of the unobserved processes (i.e., the random effects). Thus, common diagnostic tools and model selection techniques that are routinely applied to statistical catch-at-age models may be inappropriate for state-space models. Alternative diagnostics have been proposed elsewhere, primarily based on evaluating short-term prediction error, however these methods have not yet been evaluated in a stock assessment context. The objective of the study is to address the need for general guidelines on appropriate diagnostic tools and model selection techniques for state-space stock assessment models. Start Date: As soon as possible. Duration: 2-year research opportunity, second year of funds contingent on federal budget Location: The postdoc will be hosted by the NOAA Northeast Fisheries Science Center at the Woods Hole Laboratory in Woods Hole, MA (currently 100% remote due to COVID-19). The position may be worked remotely or on-site (post COVID-19). Salary: The rate of pay will be commensurate with experience and qualifications. Minimum Qualifications: PhD in quantitative fisheries, statistics, applied mathematics, marine fisheries ecology, theoretical ecology, or a related field. Strong quantitative skills are required. Experience in quantitative modeling, stock assessment, population dynamics, statistics, and computer programming (R, Template Model Builder, AD Model Builder) are preferred. The successful candidate will be motivated and capable of working independently and collaboratively. The successful candidate will be expected to give oral presentations at a range of scientific fora, as well as publish in peer reviewed written literature. If you are interested in being considered for this position, please APPLY THROUGH OUR ADP WEB PORTAL, AT THE LINK AT THE TOP RIGHT OF THIS PAGE. Only qualified applicants that meet minimum experience or background requirements stated above need apply. When applying for this position you will be asked to upload your resume at the end of this online application. Applicants should submit a resume that includes the following: Cover letter that briefly describes how you meet the required and preferred qualifications listed. Work history for past 10 years or since last full-time education. Education. Previous experience or training with similar requirements. Three professional references. Include your name in the document file name. Upload your resume in readable, not scanned, PDF or Word format (PDF is preferred).

Keywords: Ocean Associates, Inc., New Bedford , Quantitative Fisheries - Stock Assessment Model - Woods Hole, MA or Telework, Other , Mattapoisett, Massachusetts

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