Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 7866
Title: Graphic representation of confidence intervals for Petersen population estimates
Author: William Spencer Davis
Publication Year: 1964
Journal: Transactions of the American Fisheries Society
Volume: 93
Issue: 3
Pages: 227-232

Probable confidence intervals for Petersen population estimates play an important part in decisions concerning the number of animals that must be marked and the size of the catch from which recaptures must be obtained.  Requirements for an acceptable confidence interval may be so difficult to satisfy as to make a study impractical, even though the confidence interval itself is based only upon magnitude of numbers and not upon their accuracy.  Graphs of the changes in confidence intervals from large to small as the magnitudes of marks applied, marks recovered, and catch change from small to large are presented to give perspective for the planning and development of Petersen population estimates.  Confidence intervals were estimated by use of published formulas, tables, and graphs. 

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