Extended survivors analysis: An improved method for the analysis of catch-at-age data and abundance indices

Conventional methods for the tuning of virtual population analysis using abundance indices are particularly sensitive to observation error in the final year, because they treat these data as though they were exact. They also fail to make efficient use of all available data, because they ignore previous estimates of year-class strength. The Survivors method of Doubleday addresses these deficiencies, but suffers from a number of technical...