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Mortality Estimation: Biased Results from Unbiased Ages
Canadian Journal of Fisheries and Aquatic Sciences
Estimates of mortality rates from age distributions are biased by imprecision in age estimation, even if age estimates are unbiased. I have derived a method for predicting the magnitude of this bias from information on the precision of age determination. Monte Carlo simulations show that bias can be accurately predicted. The commonly used Chapman-Robson mortality estimator is shown to be robust to imprecision in age determination if all age-classes are included. Errors are likely, however, ifdoi:10.1139/f84-227 fatcat:4barfkauvfd4tlwj4rrp5vrsjm