Age-Based Survival and Mortality Estimators for Cluster Sampling
Calculates the survival and mortality estimators of Jensen (1996) where net hauls are treated as samples
the vector of ages. Each row represents the age of an individual.
the vector containing variable used to identify the sampling unit (e.g., haul). Identifier can be numeric or character.
the fully-recruited age.
the maximum age to include in the calculation. If not specified, the oldest age is used.
The individual age data are tabulated and subsetted based on
last. The calculations follow Jensen(1996).
If only two ages are present, a warning message is generated.
Matrix containing estimates of annual mortality (a), annual survival (S), and instantaneous total mortality (Z) and associated standard errors.
Gary A. Nelson, Massachusetts Division of Marine Fisheries firstname.lastname@example.org
Jensen, A. L. 1996. Ratio estimation of mortality using catch curves. Fisheries Research 27: 61-67.