Revista de Saúde Pública
On-line version ISSN 1518-8787
SANTOS, Jair Licío Ferreira and OLIVA, Waldyr Muniz. On Zippin's procedure for the estimation of animal populations. Rev. Saúde Pública [online]. 1991, vol.25, n.1, pp. 53-55. ISSN 1518-8787. http://dx.doi.org/10.1590/S0034-89101991000100011.
Zippin's procedure is one of the most accurate methods used to estimate total populations from removal trapping data. However, explicit algebraic solutions of the maximum likelihood equations do not exist. Hitherto they have been obtained from graphs known as Zippin charts. In this paper a Newton-Raphson procedure is used to obtain numerical solutions to the equations. Comparisons with the classical method show some differences in the parameters, particularly in the estimation of the standard error.
Keywords : Populations estimates; Estimation technics.