Results 141 to 150 of about 6,368,094 (187)

Adaptive Line Transect Sampling

Biometrics, 2002
Adaptive line transect sampling offers the potential of improved population density estimation efficiency over conventional line transect sampling when populations are spatially clustered. In adaptive sampling, survey effort is increased when areas of high animal density are located, thereby increasing the number of observations.
S T Buckland
exaly   +6 more sources

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Line Transect Sampling in Small and Large Regions

Biometrics, 2005
SummaryMelville and Welsh(2001,Biometrics57,1130–1137) consider an approach to line transect sampling using a separate calibration study to estimate the detection functiong. They present a simulation study contrasting their results with poor results from a traditional estimator, labeled the “Buckland” estimator and referenced toBuckland et al.(1993 ...
Rachel Fewster, Stephen Buckland, Jeffrey L Laake   +2 more
exaly   +3 more sources

Some Mathematical Models for Line Transect Sampling

Biometrical Journal, 1985
AbstractANDERSON and POSPAHALA (1970) investigated the estimation of wildlife population size using the belt or line transect sampling method and devised a correction for bias, thus leading to an estimator with interesting characteristics. This work was given a uniform mathematical framework in BURNHAM and ANDERSON (1976).
Anderson, D. R., Burnham, K. P., Crain, B. R.   +2 more
exaly   +3 more sources

Line Transect Sampling from a Curving Path

Biometrics, 2001
Cutting straight line transects through dense forest is time consuming and expensive when large areas need to be surveyed for rare or highly clustered species. We argue that existing paths or game trails may be suitable as transects for line transect sampling even though they will not, in general, run straight.
Lex Hiby
exaly   +3 more sources

Local likelihood density estimation in line transect sampling

Environmetrics, 2000
A novel semiparametric estimator for the probability density function of detected distances in line transect sampling is proposed. The estimator is obtained using a local likelihood density estimation approach, a technique recently proposed which affords the advantages of both parametric and nonparametric methods, i.e. accuracy and robustness. Moreover,
Lucio Barabesi
exaly   +3 more sources

A bias-corrected histogram estimator for line transect sampling

Communications in Statistics - Theory and Methods, 2018
ABSTRACTThe classical histogram method has already been applied in line transect sampling to estimate the parameter f(0), which in turns is used to estimate the population abundance D or the popula...
Omar Eidous, Fahid Al-Eibood
exaly   +2 more sources

A Semiparametric Model for Line Transect Sampling

Communications in Statistics - Theory and Methods, 2006
This paper introduces an appealing semiparametric model for estimating wildlife abundance based on line transect data. The proposed method requires the existence of a parametric model and then improves the estimator using a kernel method. Properties of the resultant estimator are derived and an expression for the asymptotic mean square error (AMSE) of ...
exaly   +2 more sources

On Improving Kernel Estimators Using Line Transect Sampling

Communications in Statistics - Theory and Methods, 2005
ABSTRACT We investigate some possibilities for improvements of kernel density estimates using line transect sampling. A bias correction approach is used which produces a new estimator for density of object D. The asymptotic bias of kernel estimator is subtracted from the kernel estimator to form the proposed estimator.
Omar Eidous‬‎
exaly   +2 more sources

On the Line Transect Sampling Method

Biometrics, 1974
Theory has been developed in the present paper for estimating wildlife density and its standard error by the line transect method of sampling using both right angle and radial distances and based on different assumptions than those made by Gates et al. [1968]. It is shown that relatively better fits are realized when the assumptions are tested with the
Sen, A. R., Tourigny, J., Smith, G. E. J.   +2 more
openaire   +1 more source

Size Bias in Line Transect Sampling

Biometrics, 1987
Line transect sampling is used to estimate the number of individuals in a study area. It is usually assumed that the detections of individuals constitute independent events, and that the probability of detecting an item is a function of its perpendicular distance from the transect.
Drummer, Thomas D., McDonald, Lyman L.
openaire   +2 more sources