William Link, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 44
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Filter Total Items: 128
The 1994 and 1995 summary of the North American Breeding Bird Survey The 1994 and 1995 summary of the North American Breeding Bird Survey
Data from the North American Breeding Bird Survey were used to estimate continental and regional changes in bird populations for the 2-year periods of 1993-1994 and 1994-1995. These 2-year changes were placed in the context of population trends estimated over the 1966-1995 interval. The 2-year changes were more positive during the 1993-1994 period, when 54.2% of all species exhibited...
Authors
B.G. Peterjohn, J.R. Sauer, W.A. Link
Estimation and confidence intervals for empirical mixing distributions Estimation and confidence intervals for empirical mixing distributions
Questions regarding collections of parameter estimates can frequently be expressed in terms of an empirical mixing distribution (EMD). This report discusses empirical Bayes estimation of an EMD, with emphasis on the construction of interval estimates. Estimation of the EMD is accomplished by substitution of estimates of prior parameters in the posterior mean of the EMD. This procedure is
Authors
W.A. Link, J.R. Sauer
Correcting for overdispersion in tests of prey selectivity Correcting for overdispersion in tests of prey selectivity
No abstract available.
Authors
W.A. Link, K. U. Karanth
The 1992 and 1993 summary of the North American Breeding Bird Survey The 1992 and 1993 summary of the North American Breeding Bird Survey
Using data from the North American Breeding Bird Survey (BBS), continental and regional changes in bird populations were estimated for the 2-year periods of 1991-1992 and 1992-1993. These 2-year changes were placed in the context of population trends since 1966. During 1991-1992, 62% of all species exhibited positive continental trend estimates. For species showing significant population...
Authors
B.G. Peterjohn, J.R. Sauer, W.A. Link
Estimating breeding proportions and testing hypotheses about costs of reproduction with capture-recapture data Estimating breeding proportions and testing hypotheses about costs of reproduction with capture-recapture data
The proportion of animals in a population that breeds is an important determinant of population growth rate. Usual estimates of this quantity from field sampling data assume that the probability of appearing in the capture or count statistic is the same for animals that do and do not breed. A similar assumption is required by most existing methods used to test ecologically interesting...
Authors
James D. Nichols, James E. Hines, Kenneth H. Pollock, Robert L. Hinz, William A. Link
Within-site variability in surveys of wildlife populations Within-site variability in surveys of wildlife populations
Most large-scale surveys of animal populations are based on counts of individuals observed during a sampling period, which are used as indexes to the population. The variability in these indexes not only reflects variability in population sizes among sites but also variability due to the inexactness of the counts. Repeated counts at survey sites can be used to document this additional...
Authors
William A. Link, Richard J. Barker, John R. Sauer, Sam Droege
Science and Products
Filter Total Items: 44
No results found.
Filter Total Items: 128
The 1994 and 1995 summary of the North American Breeding Bird Survey The 1994 and 1995 summary of the North American Breeding Bird Survey
Data from the North American Breeding Bird Survey were used to estimate continental and regional changes in bird populations for the 2-year periods of 1993-1994 and 1994-1995. These 2-year changes were placed in the context of population trends estimated over the 1966-1995 interval. The 2-year changes were more positive during the 1993-1994 period, when 54.2% of all species exhibited...
Authors
B.G. Peterjohn, J.R. Sauer, W.A. Link
Estimation and confidence intervals for empirical mixing distributions Estimation and confidence intervals for empirical mixing distributions
Questions regarding collections of parameter estimates can frequently be expressed in terms of an empirical mixing distribution (EMD). This report discusses empirical Bayes estimation of an EMD, with emphasis on the construction of interval estimates. Estimation of the EMD is accomplished by substitution of estimates of prior parameters in the posterior mean of the EMD. This procedure is
Authors
W.A. Link, J.R. Sauer
Correcting for overdispersion in tests of prey selectivity Correcting for overdispersion in tests of prey selectivity
No abstract available.
Authors
W.A. Link, K. U. Karanth
The 1992 and 1993 summary of the North American Breeding Bird Survey The 1992 and 1993 summary of the North American Breeding Bird Survey
Using data from the North American Breeding Bird Survey (BBS), continental and regional changes in bird populations were estimated for the 2-year periods of 1991-1992 and 1992-1993. These 2-year changes were placed in the context of population trends since 1966. During 1991-1992, 62% of all species exhibited positive continental trend estimates. For species showing significant population...
Authors
B.G. Peterjohn, J.R. Sauer, W.A. Link
Estimating breeding proportions and testing hypotheses about costs of reproduction with capture-recapture data Estimating breeding proportions and testing hypotheses about costs of reproduction with capture-recapture data
The proportion of animals in a population that breeds is an important determinant of population growth rate. Usual estimates of this quantity from field sampling data assume that the probability of appearing in the capture or count statistic is the same for animals that do and do not breed. A similar assumption is required by most existing methods used to test ecologically interesting...
Authors
James D. Nichols, James E. Hines, Kenneth H. Pollock, Robert L. Hinz, William A. Link
Within-site variability in surveys of wildlife populations Within-site variability in surveys of wildlife populations
Most large-scale surveys of animal populations are based on counts of individuals observed during a sampling period, which are used as indexes to the population. The variability in these indexes not only reflects variability in population sizes among sites but also variability due to the inexactness of the counts. Repeated counts at survey sites can be used to document this additional...
Authors
William A. Link, Richard J. Barker, John R. Sauer, Sam Droege