We revisit the classic problem of estimation of the binomial parameters when both parameters
n, p are unknown. We start with a series of results that illustrate the fundamental difficulties in the
problem. Specifically, we establish lack of unbiased estimates for essentially any functions of just
n or just p. We also quantify just how badly biased the sample maximum is as an estimator of n.
Then, we motivate and present two new estimators of n. One is a new moment estimate and the
other is a bias correction of the sample maximum. Both are easy to motivate, compute, and jackknife.
The second estimate frequently beats most common estimates of n in the simulations, including the
Carroll–Lombard estimate. This estimate is very promising. We end with a family of estimates for p;
a specific one from the family is compared to the presently common estimate max{1 − S2/X, ¯ 0} and
the improvements in mean-squared error are often very significant. In all cases, the asymptotics are
derived in one domain. Some other possible estimates such as a truncated MLE and empirical Bayes
methods are briefly discussed
We revisit the classic problem of estimation of the binomial parameters when both parameters
n, p are unknown. We start with a series of results that illustrate the fundamental difficulties in the
problem. Specifically, we establish lack of unbiased estimates for essentially any functions of just
n or just p. We also quantify just how badly biased the sample maximum is as an estimator of n.
Then, we motivate and present two new estimators of n. One is a new moment estimate and the
other is a bias correction of the sample maximum. Both are easy to motivate, compute, and jackknife.
The second estimate frequently beats most common estimates of n in the simulations, including the
Carroll–Lombard estimate. This estimate is very promising. We end with a family of estimates for p;
a specific one from the family is compared to the presently common estimate max{1 − S2/X, ¯ 0} and
the improvements in mean-squared error are often very significant. In all cases, the asymptotics are
derived in one domain. Some other possible estimates such as a truncated MLE and empirical Bayes
methods are briefly discussed
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