Changes between Version 2 and Version 3 of EwEugTimeSeriesFittingInEcosimEvaluatingFisheriesAndEnvironmentalEffects
 Timestamp:
 20100128 16:31:29 (10 years ago)
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EwEugTimeSeriesFittingInEcosimEvaluatingFisheriesAndEnvironmentalEffects
v2 v3 9 9 The time series fitting uses either fishing effort or fishing mortality data as driving factors for the Ecosim model runs. A statistical measure of goodness of fit to the time series data outlined above is generated each time Ecosim is run. The model allows four types of analysis with the SS measure (see [wiki:FitToTimeSeries Fit to time series] for help with implementing these analyses): 10 10 11 1. Determine sensitivity of SS to the critical Ecosim [wiki:VulnerabilitiesFlowControlForagingArenaParameter Vulnerability] ]parameters by changing each one slightly (1%) then rerunning the model to see how much SS is changed, (i.e., how sensitive the time series predictions ‘supported’ by data are to the vulnerabilities);11 1. Determine sensitivity of SS to the critical Ecosim [wiki:VulnerabilitiesFlowControlForagingArenaParameter Vulnerability] parameters by changing each one slightly (1%) then rerunning the model to see how much SS is changed, (i.e., how sensitive the time series predictions ‘supported’ by data are to the vulnerabilities); 12 12 13 13 2. Search for vulnerability estimates that give better ‘fits’ of Ecosim to the time series data (lower SS), with vulnerabilities ‘blocked’ by the user into sets that are expected to be similar;