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<br />------------------- <br /> <br /> <br />Population Estimation <br /> <br />. Pop estimator (N)=(M+1 )(C+1 )/(R+1 ), <br /><Chapman modification of Petersen method <br />. Confidence intervals based on Poisson .. <br />frequency distribution using recapture <br />number as determining variable (Ricker <br />1975 ) <br />