(HP67) Two stockassessment programs

01162019, 09:01 PM
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(HP67) Two stockassessment programs
An extract from Two stockassessment programs for a programmable pocket calculator, ICNAF Res.Doc. 77/VI/47, JUN 1977.
Continuing advances in computing power of pocket electronic calculators now allow stockassessment calculations usually performed by computers to be carried out virtually at an assessment meeting table. Programs for virtual population analysis and catch projections for the newlyreleased HP67 calculator are presented here. Virtual Population Analysis The first program performs cohort or exact virtual population analysis on a yearclass of up to 19 agegroups. Data are retained so that alternative values for natural and fishing mortalities can be examined without reentering data. The exact solution follows the method of Doubleday, 1976. F is estimated to 0.001 or the predicted catch is within 0.001 of the observed catch, whichever occurs first. Catch Projection A standard catch projection for up to ten agegroups is performed. Either TAC or F may be set and the other calculated. Changing the units of population size makes corresponding changes on the units of output so that the desired number of significant digits can be retained. BEST! SlideRule ps: see also (HP65) A Simple Iterative Solution to the Catch Equation (HP25) Resolution of the Catch Equation by a Simple Iterative Method 

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