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  • 11
    Electronic Resource
    Electronic Resource
    Inferring extinction in a declining population (1993)
    Springer
    Journal of mathematical biology 32 (1993), S. 79-82 
    Details
    ISSN: 1432-1416
    Keywords: Sighting data ; Non-stationary Poisson process ; Black-footed ferret
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract This note describes a test for extinction in a declining population based on a record of sightings. The test assumes that, prior to extinction, the sightings follow a Poisson process with decreasing rate function. An application to a sighting record of the black-footed ferret is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160376
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  • 12
    Electronic Resource
    Electronic Resource
    A counter-intuitive result for mixture random fields (1989)
    Springer
    Mathematical geology 21 (1989), S. 379-382 
    Details
    ISSN: 1573-8868
    Keywords: Indicator field ; mixture model ; random field
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00893697
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  • 13
    Electronic Resource
    Electronic Resource
    Geostatistical cross-validation: A cautionary note (1990)
    Springer
    Mathematical geology 22 (1990), S. 637-639 
    Details
    ISSN: 1573-8868
    Keywords: spatial covariance ; kriging ; geostatistical cross-validation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00890512
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    Paper (German National Licenses)
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  • 14
    Electronic Resource
    Electronic Resource
    Estimating the size of the source population from a matched sample of parts (1996)
    Springer
    Mathematical geology 28 (1996), S. 783-789 
    Details
    ISSN: 1573-8868
    Keywords: disarticulation ; maximum likelihood estimation ; taphonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract This paper discusses the problem of estimating the size of a source population from a sample of matched, disaritculated body parts. Maximum likelihood estimation and the construction of a confidence interval are described. This problem is connected to the ecological problem of estimating the number of spectes in a sampled community.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066346
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    Paper (German National Licenses)
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  • 15
    Electronic Resource
    Electronic Resource
    Bootstrapping correlated data (1985)
    Springer
    Mathematical geology 17 (1985), S. 769-775 
    Details
    ISSN: 1573-8868
    Keywords: bootstrap ; sampling distribution ; estimation variance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01031616
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    Paper (German National Licenses)
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  • 16
    Electronic Resource
    Electronic Resource
    Estimating monthly streamflow values by cokriging (1986)
    Springer
    Mathematical geology 18 (1986), S. 785-809 
    Details
    ISSN: 1573-8868
    Keywords: streamflow estimation ; cokriging ; nonstationary covariance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Cokriging is applied to estimation of missing monthly streamflow values in three records from gaging stations in west central Virginia. Missing values are estimated from optimal consideration of the pattern of auto- and cross-correlation among standardized residual log-flow records. Investigation of the sensitivity of estimation to data configuration showed that when observations are available within two months of a missing value, estimation is improved by accounting for correlation. Concurrent and lag-one observations tend to screen the influence of other available observations. Three models of covariance structure in residual log-flow records are compared using cross-validation. Models differ in how much monthly variation they allow in covariance. Precision of estimation, reflected in mean squared error (MSE), proved to be insensitive to this choice. Cross-validation is suggested as a tool for choosing an inverse transformation when an initial nonlinear transformation is applied to flow values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899744
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  • 17
    Electronic Resource
    Electronic Resource
    Mapping by simple indicator kriging (1986)
    Springer
    Mathematical geology 18 (1986), S. 335-352 
    Details
    ISSN: 1573-8868
    Keywords: binary map ; nearest-neighbor method ; simple indicator kriging ; dichotomized Gaussian field
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract The problem of predicting the type of an unsampled point in a two-type map is addressed using a procedure called simple indicator kriging. This procedure estimates the conditional probability that the point is of one type or the other given the types of sample points. Simple indicator kriging is applied to examples of certain map models. It is shown to perform well, and in some cases to be exact in a specified sense. Use of simple indicator kriging to estimate multivariate normal quandrant probabilities is explored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00898037
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  • 18
    Electronic Resource
    Electronic Resource
    On the efficiency of the indicator approach in geostatistics (1993)
    Springer
    Mathematical geology 25 (1993), S. 53-57 
    Details
    ISSN: 1573-8868
    Keywords: Gaussian random field ; indicator kriging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract A common problem in geostatistics is to determine whether or not the value of a random field at an unsampled location exceeds a specified threshold using observed values of the random field at sampled locations. Under the indicator approach, the only information used to classify the unobserved value is whether or not the observed values exceed the threshold. This note shows that the loss of information from applying the indicator approach may be modest in the case where the underlying random field is Gaussian.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00890675
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    Paper (German National Licenses)
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  • 19
    Electronic Resource
    Electronic Resource
    The Value of Improved ENSO Prediction to U.S. Agriculture (1998)
    Springer
    Climatic change 39 (1998), S. 47-60 
    Details
    ISSN: 1573-1480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The economic value of long-range weather prediction is measured by the increase in social welfare arising from the use of the prediction in economic decisionmaking. This paper describes a study of the economic value of ENSO prediction to U.S. agriculture. The interdisciplinary study involved the analysis of data and models from meteorology, plant science, and economics under a framework based on Bayesian decision analysis. The estimated annual value of perfect ENSO prediction to U.S. agriculture is $323 million.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005342500057
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  • 20
    Electronic Resource
    Electronic Resource
    On Testing for Change in Extreme Events (1999)
    Springer
    Climatic change 42 (1999), S. 341-349 
    Details
    ISSN: 1573-1480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A common problem in climatology is detecting a change in the frequency or magnitude of extreme events in an historical time series. This paper compares the performance of two general approaches to this problem in a simple situation. The first approach is based on modelling the entire distribution, while the second approach focuses on the tail of the distribution. Although the second approach has clear advantages, the results of this paper suggest that it can also involve a substantial loss of information.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005441005005
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