Abstract:
:Spatial replication is a common theme in count surveys of animals. Such surveys often generate sparse count data from which it is difficult to estimate population size while formally accounting for detection probability. In this article, I describe a class of models (N-mixture models) which allow for estimation of population size from such data. The key idea is to view site-specific population sizes, N, as independent random variables distributed according to some mixing distribution (e.g., Poisson). Prior parameters are estimated from the marginal likelihood of the data, having integrated over the prior distribution for N. Carroll and Lombard (1985, Journal of American Statistical Association 80, 423-426) proposed a class of estimators based on mixing over a prior distribution for detection probability. Their estimator can be applied in limited settings, but is sensitive to prior parameter values that are fixed a priori. Spatial replication provides additional information regarding the parameters of the prior distribution on N that is exploited by the N-mixture models and which leads to reasonable estimates of abundance from sparse data. A simulation study demonstrates superior operating characteristics (bias, confidence interval coverage) of the N-mixture estimator compared to the Caroll and Lombard estimator. Both estimators are applied to point count data on six species of birds illustrating the sensitivity to choice of prior on p and substantially different estimates of abundance as a consequence.
journal_name
Biometricsjournal_title
Biometricsauthors
Royle JAdoi
10.1111/j.0006-341X.2004.00142.xsubject
Has Abstractpub_date
2004-03-01 00:00:00pages
108-15issue
1eissn
0006-341Xissn
1541-0420pii
BIOM142journal_volume
60pub_type
杂志文章相关文献
BIOMETRICS文献大全abstract::In this article, we describe a Bayesian approach to the calibration of a stochastic computer model of chemical kinetics. As with many applications in the biological sciences, the data available to calibrate the model come from different sources. Furthermore, these data appear to provide somewhat conflicting informatio...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2009.01245.x
更新日期:2010-03-01 00:00:00
abstract::Calibration, the statistical consistency of forecast distributions and the observations, is a central requirement for probabilistic predictions. Calibration of continuous forecasts is typically assessed using the probability integral transform histogram. In this article, we propose significance tests based on scoring ...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2010.01406.x
更新日期:2010-12-01 00:00:00
abstract::We propose a generalized linear mixed model to estimate and test marginal effects on titers repeatedly measured by serial dilution assays. The link is log-log and the titer is assumed to follow a gamma distribution. The parameters are estimated by generalized estimating equations. The marginal effects are tested by me...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1998-06-01 00:00:00
abstract::Parametric survival functions are usually defined as explicit functions of time and covariates. However, consideration of some simple differential equations describing certain survival curves leads to a descriptive equation which cannot be explicitly solved for the survival function. Nevertheless, the resulting surviv...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1995-03-01 00:00:00
abstract::We consider modeling correlated survival data when cluster sizes may be informative to the outcome of interest based on a within-cluster resampling (WCR) approach and a weighted score function (WSF) method. We derive the large sample properties for the WCR estimators under the Cox proportional hazards model. We establ...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2006.00730.x
更新日期:2007-09-01 00:00:00
abstract::Conventional statistical determinations of sample size in phase II studies typically lead to sample sizes of the order of 25 (Schoenfeld, 1980, International Journal of Radiation Oncology, Biology and Physics 6, 371-374). When the development of new treatments is proceeding rapidly relative to the recruitment of suita...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1985-06-01 00:00:00
abstract::In most research on smoothing splines the focus has been on estimation, while inference, especially hypothesis testing, has received less attention. By defining design matrices for fixed and random effects and the structure of the covariance matrices of random errors in an appropriate way, the cubic smoothing spline a...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2010.01537.x
更新日期:2011-09-01 00:00:00
abstract::Joint models are formulated to investigate the association between a primary endpoint and features of multiple longitudinal processes. In particular, the subject-specific random effects in a multivariate linear random-effects model for multiple longitudinal processes are predictors in a generalized linear model for pr...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2007.00822.x
更新日期:2007-12-01 00:00:00
abstract::Variable selection for clustering is an important and challenging problem in high-dimensional data analysis. Existing variable selection methods for model-based clustering select informative variables in a "one-in-all-out" manner; that is, a variable is selected if at least one pair of clusters is separable by this va...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2009.01341.x
更新日期:2010-09-01 00:00:00
abstract::Epidemiological studies involving biomarkers are often hindered by prohibitively expensive laboratory tests. Strategically pooling specimens prior to performing these lab assays has been shown to effectively reduce cost with minimal information loss in a logistic regression setting. When the goal is to perform regress...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/biom.12134
更新日期:2014-03-01 00:00:00
abstract::We propose methods for Bayesian inference for a new class of semiparametric survival models with a cure fraction. Specifically, we propose a semiparametric cure rate model with a smoothing parameter that controls the degree of parametricity in the right tail of the survival distribution. We show that such a parameter ...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.0006-341x.2001.00383.x
更新日期:2001-06-01 00:00:00
abstract::Morrissey and Spiegelman (1999, Biometrics 55, 338 344) provided a comparative study of adjustment methods for exposure misclassification in case-control studies equipped with an internal validation sample. In addition to the maximum likelihood (ML) approach, they considered two intuitive procedures based on proposals...
journal_title:Biometrics
pub_type: 评论,杂志文章
doi:10.1111/j.0006-341x.2002.1034_1.x
更新日期:2002-12-01 00:00:00
abstract::In clinical studies, longitudinal biomarkers are often used to monitor disease progression and failure time. Joint modeling of longitudinal and survival data has certain advantages and has emerged as an effective way to mutually enhance information. Typically, a parametric longitudinal model is assumed to facilitate t...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2007.00896.x
更新日期:2008-06-01 00:00:00
abstract::We study publication bias in meta-analysis by supposing there is a population (y, sigma) of studies which give treatment effect estimates y approximately N(theta, sigma(2)). A selection function describes the probability that each study is selected for review. The overall estimate of theta depends on the studies selec...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2006.00705.x
更新日期:2007-06-01 00:00:00
abstract::The Wilcoxon rank sum test is widely used for two-group comparisons for nonnormal data. An assumption of this test is independence of sampling units both between and within groups. In ophthalmology, data are often collected on two eyes of an individual, which are highly correlated. In ophthalmological clinical trials,...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2006.00582.x
更新日期:2006-12-01 00:00:00
abstract::There has been great interest in developing nonlinear structural equation models and associated statistical inference procedures, including estimation and model selection methods. In this paper a general semiparametric structural equation model (SSEM) is developed in which the structural equation is composed of nonpar...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2012.01751.x
更新日期:2012-06-01 00:00:00
abstract::Genetic variants associated with disease outcomes can be used to develop personalized treatment. To reach this precision medicine goal, hundreds of large-scale genome-wide association studies (GWAS) have been conducted in the past decade to search for promising genetic variants associated with various traits. They hav...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/biom.13076
更新日期:2019-12-01 00:00:00
abstract::In this paper, a Markov process is developed as a mathematical model to study the general problem of quality control monitoring. This approach was previously used by Arnold (1970) in development of sampling plans to study the water quality monitoring of streams. Arnold considered the expected sample size required for ...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1977-03-01 00:00:00
abstract::Precision medicine seeks to provide treatment only if, when, to whom, and at the dose it is needed. Thus, precision medicine is a vehicle by which healthcare can be made both more effective and efficient. Individualized treatment rules operationalize precision medicine as a map from current patient information to a re...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/biom.12743
更新日期:2018-03-01 00:00:00
abstract::Capture-recapture models were originally developed to account for encounter probabilities that are less than 1 in free-ranging animal populations. Nowadays, these models can deal with the movement of animals between different locations and are also used to study transitions between different states. However, their use...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.1541-0420.2005.00318.x
更新日期:2005-06-01 00:00:00
abstract::Missing values appear very often in many applications, but the problem of missing values has not received much attention in testing order-restricted alternatives. Under the missing at random (MAR) assumption, we impute the missing values nonparametrically using kernel regression. For data with imputation, the classica...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/biom.12658
更新日期:2017-09-01 00:00:00
abstract::We extend the linear random-effects growth curve model (REGCM) (Laird and Ware, 1982, Biometrics 38, 963-974) to study the effects of population covariates on one or more characteristics of the growth curve when the characteristics are expressed as linear combinations of the growth curve parameters. This definition in...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1997-06-01 00:00:00
abstract::Complex issues arise when investigating the association between longitudinal immunologic measures and time to an event, such as time to relapse, in cancer vaccine trials. Unlike many clinical trials, we may encounter patients who are cured and no longer susceptible to the time-to-event endpoint. If there are cured pat...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/1541-0420.00079
更新日期:2003-09-01 00:00:00
abstract::Although the primary focus of Phase I clinical trials is to assess clinical pharmacology and possible toxicities, any information on the potential effect of treatment would be useful in helping to determine priorities between treatments for further study. We consider the scenario where data are routinely collected on ...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1995-09-01 00:00:00
abstract::Receiver operating characteristic (ROC) curves are frequently used to assess the usefulness of diagnostic markers. When several diagnostic markers are available, they can be combined by a best linear combination: that is, when the area under the ROC curve of this combination is maximized among all possible linear comb...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1997-06-01 00:00:00
abstract::A ranked set sampling procedure with unequal samples (RSSU) is proposed and used to estimate the population mean. This estimator is then compared with the estimators based on the ranked set sampling (RSS) and median ranked set sampling (MRSS) procedures. It is shown that the relative precisions of the estimator based ...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.0006-341x.2001.00957.x
更新日期:2001-09-01 00:00:00
abstract::The distribution of ventilation-perfusion ratio over the lung is a useful indicator of the efficiency of lung function. Information about this distribution can be obtained by observing the retention in blood of inert gases passed through the lung. These retentions are related to the ventilation-perfusion distribution ...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1992-03-01 00:00:00
abstract::The data set presented relates a binomial response to ordered levels of an explanatory variable, representing doses of a drug, with data collected at several centers. A study goal is to test independence of the response and the ordinal factor, assuming under the alternative only that the binomial parameter is a monoto...
journal_title:Biometrics
pub_type: 杂志文章
doi:
更新日期:1996-09-01 00:00:00
abstract::We describe an adaptive Bayesian design for a clinical trial of an experimental treatment for patients with hematologic malignancies who initially received an allogeneic bone marrow transplant but subsequently suffered a disease recurrence. Treatment consists of up to two courses of targeted immunotherapy followed by ...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/j.0006-341x.2002.00560.x
更新日期:2002-09-01 00:00:00
abstract::Treatments are frequently evaluated in terms of their effect on patient survival. In settings where randomization of treatment is not feasible, observational data are employed, necessitating correction for covariate imbalances. Treatments are usually compared using a hazard ratio. Most existing methods which quantify ...
journal_title:Biometrics
pub_type: 杂志文章
doi:10.1111/biom.12542
更新日期:2017-03-01 00:00:00