Last chance! 50% off unlimited learning
Sale ends in
Calculates the survival and mortality estimators of Jensen (1996) where net hauls are treated as samples
agesurvcl(age = NULL, group = NULL, full = NULL, last = NULL)Matrix containing estimates of annual mortality (a), annual survival (S), and instantaneous total mortality (Z) and associated standard errors.
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.
Gary A. Nelson, Massachusetts Division of Marine Fisheries gary.nelson@mass.gov
The individual age data are tabulated and subsetted based on full and last. The calculations follow Jensen(1996).
If only two ages are present, a warning message is generated.
Jensen, A. L. 1996. Ratio estimation of mortality using catch curves. Fisheries Research 27: 61-67.
agesurv
data(Jensen)
agesurvcl(age=Jensen$age,group=Jensen$group,full=0)
Run the code above in your browser using DataLab