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Portland (AFS) 2015

Materials for the "Age and Growth Analyses with R" CE course at the AFS meeting in Portland, OR in August, 2015

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Course Description

This one-day course is for fisheries professionals and students interested in expanding their R skills to include analysis of age and growth data. Through a sequence of demonstrations and hands-on application exercises, participants will use R to construct appropriate metrics and graphics for comparing precision (APE, ACV) and bias (age agreement table, tests of symmetry, and age-bias plots) between two sets of estimated ages, construct and apply an age-length key to estimate ages of individual fish from their lengths, summarize mean length-at-age with a von Bertalanffy growth function (VBGF), and statistically compare VBGF parameters between two or more groups of fish. Participants should be familiar with the fundamentals of R, including basic applications.

Pre-Course Preparation

Course Materials

  1. Age Comparisons -- Precision and Bias

  2. Age-Length Key -- Construction

  3. Age-Length Key -- Application

  4. Growth -- Fit von Bertalanffy Growth Function

  5. Growth -- Compare von Bertalanffy Growth Functions