Ordinal classification scales are commonly used to define a patient’s disease status in screening... more Ordinal classification scales are commonly used to define a patient’s disease status in screening and diagnostic tests such as mammography. Challenges arise in agreement studies when evaluating the association between many raters’ classifications of patients’ disease or health status when an ordered categorical scale is used. In this paper, we describe a population-based approach and chance-corrected measure of association to evaluate the strength of relationship between multiple raters’ ordinal classifications where any number of raters can be accommodated. In contrast to Shrout and Fleiss’ intraclass correlation coefficient, the proposed measure of association is invariant with respect to changes in disease prevalence. We demonstrate how unique characteristics of individual raters can be explored using random effects. Simulation studies are conducted to demonstrate the properties of the proposed method under varying assumptions. The methods are applied to two large-scale agreement...
Coastal ecosystems are easily overexploited and changed by physical and biological factors. In th... more Coastal ecosystems are easily overexploited and changed by physical and biological factors. In this paper, we discuss current ideas and arguments for coastal ecosystem management with an emphasis on systems that have large bivalve filter feeder components. For centuries the species or population approach has been utilized in fisheries management. With the growing knowledge base on specific environmental effects and
Journal of Statistical Computation and Simulation, 1985
Barnard (1963), Birnbaum (1974), and others have proposed exact inference procedures based on sim... more Barnard (1963), Birnbaum (1974), and others have proposed exact inference procedures based on simulation. This article surveys existing results in this general area and fills several important holes, addressing philosophical problems and the matter of determining a simulation size. Applications to multiple comparisons, sequential analysis, and statistical consulting are discussed.
ABSTRACT We report here the experimental design and observations from the premanipulation year of... more ABSTRACT We report here the experimental design and observations from the premanipulation year of an ecosyaem-level study investigating the hypothesis that oyster reefs control the structure and function of intertidal creeks. A group of eight tidal creeks in North Inlet, South ...
Journal of the American Statistical Association, 1983
Let 'Tm, 'I2, . . ., 'Tk be k - 2 sources of observations (treatments, populations... more Let 'Tm, 'I2, . . ., 'Tk be k - 2 sources of observations (treatments, populations) and suppose the "goodness" of treatment rTi is characterized by the size of an unknown real-valued parameter Oi. Let O[k] = maxl-ik Oi. If'I i is ... KEY WORDS: Multiple comparisons; Ranking and se- ...
Communications in Statistics-Simulation and …, 1993
... upper-cr percentage points c2 for use in a specific application, multiple Copyright 0 1993 by... more ... upper-cr percentage points c2 for use in a specific application, multiple Copyright 0 1993 by Marcel Dekker, Inc. Page 2. 766 ... it is possible to construct a (1-a)l00% confidence band which is narrower than the ~cheffk band, as explored by Casella and Strawderman (1980). ...
Ordinal classification scales are commonly used to define a patient’s disease status in screening... more Ordinal classification scales are commonly used to define a patient’s disease status in screening and diagnostic tests such as mammography. Challenges arise in agreement studies when evaluating the association between many raters’ classifications of patients’ disease or health status when an ordered categorical scale is used. In this paper, we describe a population-based approach and chance-corrected measure of association to evaluate the strength of relationship between multiple raters’ ordinal classifications where any number of raters can be accommodated. In contrast to Shrout and Fleiss’ intraclass correlation coefficient, the proposed measure of association is invariant with respect to changes in disease prevalence. We demonstrate how unique characteristics of individual raters can be explored using random effects. Simulation studies are conducted to demonstrate the properties of the proposed method under varying assumptions. The methods are applied to two large-scale agreement...
Coastal ecosystems are easily overexploited and changed by physical and biological factors. In th... more Coastal ecosystems are easily overexploited and changed by physical and biological factors. In this paper, we discuss current ideas and arguments for coastal ecosystem management with an emphasis on systems that have large bivalve filter feeder components. For centuries the species or population approach has been utilized in fisheries management. With the growing knowledge base on specific environmental effects and
Journal of Statistical Computation and Simulation, 1985
Barnard (1963), Birnbaum (1974), and others have proposed exact inference procedures based on sim... more Barnard (1963), Birnbaum (1974), and others have proposed exact inference procedures based on simulation. This article surveys existing results in this general area and fills several important holes, addressing philosophical problems and the matter of determining a simulation size. Applications to multiple comparisons, sequential analysis, and statistical consulting are discussed.
ABSTRACT We report here the experimental design and observations from the premanipulation year of... more ABSTRACT We report here the experimental design and observations from the premanipulation year of an ecosyaem-level study investigating the hypothesis that oyster reefs control the structure and function of intertidal creeks. A group of eight tidal creeks in North Inlet, South ...
Journal of the American Statistical Association, 1983
Let 'Tm, 'I2, . . ., 'Tk be k - 2 sources of observations (treatments, populations... more Let 'Tm, 'I2, . . ., 'Tk be k - 2 sources of observations (treatments, populations) and suppose the "goodness" of treatment rTi is characterized by the size of an unknown real-valued parameter Oi. Let O[k] = maxl-ik Oi. If'I i is ... KEY WORDS: Multiple comparisons; Ranking and se- ...
Communications in Statistics-Simulation and …, 1993
... upper-cr percentage points c2 for use in a specific application, multiple Copyright 0 1993 by... more ... upper-cr percentage points c2 for use in a specific application, multiple Copyright 0 1993 by Marcel Dekker, Inc. Page 2. 766 ... it is possible to construct a (1-a)l00% confidence band which is narrower than the ~cheffk band, as explored by Casella and Strawderman (1980). ...
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Papers by Don Edwards