共查询到20条相似文献,搜索用时 562 毫秒
1.
2.
In this paper we study the asymptotic properties of the sequential fixed-width rule developed for the estimation of the mean of the logistic response function based on the quantal responses observed at equally spaced dose levels. The Spearman-Karber (S-K) and Spearman-type variance (S-T-V) estimator are used for the mean and variance, respectively, in the sequential estimation. We compute the coverage probabilities and stop 相似文献
3.
4.
D. G. Bonett 《Biometrical journal. Biometrische Zeitschrift》1988,30(6):723-727
The Lincoln-Petersen and Bailey estimators of an unknown population size were compared in a computer simulation of capture-recapture sampling with replacement from small populations. The Bailey estimator was negatively biased and had smaller variance than the Petersen estimator. The Petersen estimator tended to be positively biased. The Lincoln-Petersen variance estimator tended to be positively biased while the Bailey variance estimator was negatively biased. 相似文献
5.
On variance estimation in nonparametric regression 总被引:8,自引:0,他引:8
6.
Linear models, random censoring and synthetic data 总被引:13,自引:0,他引:13
7.
We study the problem of estimating the density of a random variable G, given observations of a random variable Y = G + E. The random variable E is independent of G and its probability distribution function is considered as known. We build a family of estimators of the density of G using characteristic functions. We then derive a family of estimators of the density of Y based on the model for Y. The estimators are shown to be asymptotically unbiased and consistent. Simulations show that these estimators are better, as measured by integrated squared error, than the standard kernel estimators. Finally, we give an example of the use of this method for the detection of major genes in animal populations. 相似文献
8.
Adaptive sampling designs are becoming increasingly popular in environmental science, particularly for surveying rare and
aggregated populations. An adaptive sample is one in which the survey design is modified, or adapted, in some way on the basis
of information gained during the survey. There are many different adaptive survey designs that can be used to estimate animal
and plant abundance. In adaptive cluster sampling, additional sample effort is allocated during the survey to the immediate
neighborhood in which the species is found. In adaptive stratified sampling, additional sample effort is allocated during
the survey to strata of high abundance. The appealing feature of these adaptive designs is that the field biologist gets to
do what innately seems sensible when working with rare and aggregated populations—field effort is targeted around where the
species is observed in the first wave of the survey. However, there are logistical challenges of applying this principle of
targeted field effort while remaining in the framework of probability-based sampling. We propose a simplified adaptive survey
design that incorporates both targeting field effort and being logistically feasible. We show with a case study population
of rockfish that complete allocation stratified sampling is a very efficient design. 相似文献
9.
On estimating equations with censored data 总被引:1,自引:0,他引:1
10.
11.
In an attempt to estimate a finite population mean under the predictive approach described in Basu (1971) through the product method of estimation, we created a new product-type estimator for a two-stage sampling procedure. We also report a simulation study that is made in order to understand better the performance of the new estimator compared to the classical product estimator. 相似文献
12.
13.
14.
15.
Kernel density estimation for length biased data 总被引:3,自引:0,他引:3
16.
Nonparametric estimation of a periodic function 总被引:1,自引:0,他引:1
17.
18.
19.