Journal of Agricultural, Biological, and Environmental Statistics, Vol. 1, No. 1 (Mar., 1996), pp. 131-140 (10 pages) In recent years, more robust methods of estimating the size of a closed population ...
Recently, Beal (1987, Biometrics 43, 941-950) found Mee's modification of Anbar's approximate interval estimation for the difference in binomial parameters to be a good choice in small sample sizes.