William Link, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 44
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Filter Total Items: 128
Efficiency and optimal allocation in the staggered entry design Efficiency and optimal allocation in the staggered entry design
The staggered entry design for survival analysis specifies that r left-truncated samples are to be used in estimation of a population survival function. The ith sample is taken at time Bi, from the subpopulation of individuals having survival time exceeding Bi. This paper investigates the performance of the staggered entry design relative to the usual design in which all samples have a...
Authors
W.A. Link
Optimal allocation of point-count sampling effort Optimal allocation of point-count sampling effort
Both unlimited and fixed-radius point counts only provide indices to population size. Because longer count durations lead to counting a higher proportion of individuals at the point, proper design of these surveys must incorporate both count duration and sampling characteristics of population size. Using information about the relationship between proportion of individuals detected at a...
Authors
Richard J. Barker, John Sauer, William A. Link
The detection of density-dependence from a series of annual censuses: A comment The detection of density-dependence from a series of annual censuses: A comment
No abstract available.
Authors
William A. Link, Brett Hoover
Power calculations and model selection for trend analysis: A comment Power calculations and model selection for trend analysis: A comment
No abstract available.
Authors
William Link, Jeff Hatfield
Social foraging and feeding environment of the black-crowned night heron in an industrialized estuary Social foraging and feeding environment of the black-crowned night heron in an industrialized estuary
A nesting colony of more than 300 pairs of Black-crowned Night-Herons in the Patapsco River estuary, Baltimore Harber, Maryland was monitored from May to July 1988. The departure direction and departure time of each Heron was recorded during mornjng and evening observations at the colony. In addition, individual Herons were followed to landing sites in the estuary with small boats and...
Authors
R. Erwin, Jeff S. Hatfield, William Link
Response to Dufour and Ankney Response to Dufour and Ankney
No abstract available.
Authors
D.G. Krementz, R. Barker, W.A. Link, J.E. Hines, P.O. Corr, Ray B. Owen
An identifiable model for informative censoring An identifiable model for informative censoring
The usual model for censored survival analysis requires the assumption that censoring of observations arises only due to causes unrelated to the lifetime under consideration. It is easy to envision situations in which this assumption is unwarranted, and in which use of the Kaplan-Meier estimator and associated techniques will lead to unreliable analyses.
Authors
W.A. Link
Bias of animal population trend estimates Bias of animal population trend estimates
A computer simulation study of the population trend estimator used for the Mourning Dove Call-Count Survey, Woodcock Singing Ground Survey, Breeding Bird Survey and other surveys concluded that the estimator had negligible bias in most situations but that observer covariables should not be used with less than five years of data. With rare species (e.g. two birds per route), at least five...
Authors
P.H. Geissler, W.A. Link
Science and Products
Filter Total Items: 44
No results found.
Filter Total Items: 128
Efficiency and optimal allocation in the staggered entry design Efficiency and optimal allocation in the staggered entry design
The staggered entry design for survival analysis specifies that r left-truncated samples are to be used in estimation of a population survival function. The ith sample is taken at time Bi, from the subpopulation of individuals having survival time exceeding Bi. This paper investigates the performance of the staggered entry design relative to the usual design in which all samples have a...
Authors
W.A. Link
Optimal allocation of point-count sampling effort Optimal allocation of point-count sampling effort
Both unlimited and fixed-radius point counts only provide indices to population size. Because longer count durations lead to counting a higher proportion of individuals at the point, proper design of these surveys must incorporate both count duration and sampling characteristics of population size. Using information about the relationship between proportion of individuals detected at a...
Authors
Richard J. Barker, John Sauer, William A. Link
The detection of density-dependence from a series of annual censuses: A comment The detection of density-dependence from a series of annual censuses: A comment
No abstract available.
Authors
William A. Link, Brett Hoover
Power calculations and model selection for trend analysis: A comment Power calculations and model selection for trend analysis: A comment
No abstract available.
Authors
William Link, Jeff Hatfield
Social foraging and feeding environment of the black-crowned night heron in an industrialized estuary Social foraging and feeding environment of the black-crowned night heron in an industrialized estuary
A nesting colony of more than 300 pairs of Black-crowned Night-Herons in the Patapsco River estuary, Baltimore Harber, Maryland was monitored from May to July 1988. The departure direction and departure time of each Heron was recorded during mornjng and evening observations at the colony. In addition, individual Herons were followed to landing sites in the estuary with small boats and...
Authors
R. Erwin, Jeff S. Hatfield, William Link
Response to Dufour and Ankney Response to Dufour and Ankney
No abstract available.
Authors
D.G. Krementz, R. Barker, W.A. Link, J.E. Hines, P.O. Corr, Ray B. Owen
An identifiable model for informative censoring An identifiable model for informative censoring
The usual model for censored survival analysis requires the assumption that censoring of observations arises only due to causes unrelated to the lifetime under consideration. It is easy to envision situations in which this assumption is unwarranted, and in which use of the Kaplan-Meier estimator and associated techniques will lead to unreliable analyses.
Authors
W.A. Link
Bias of animal population trend estimates Bias of animal population trend estimates
A computer simulation study of the population trend estimator used for the Mourning Dove Call-Count Survey, Woodcock Singing Ground Survey, Breeding Bird Survey and other surveys concluded that the estimator had negligible bias in most situations but that observer covariables should not be used with less than five years of data. With rare species (e.g. two birds per route), at least five...
Authors
P.H. Geissler, W.A. Link