Scott D. Grimshaw

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It is proposed that the orientation of elongate objects, such as bones, may be used to identify the flow direction of ancient river deposits. If true, elongate objects could be of great value when ancient bedforms such as ripples and dunes are not visible. Two sandstone quarries were investigated wherein the paleoflow direction was determined from both(More)
A Markov chain is a natural probability model for accounts receivable. For example, accounts that are “current” this month have a probability of moving next month into “current”, “delinquent” or “paid-off” states. If the transition matrix of the Markov chain were known, forecasts could be formed for future months for each state. This paper applies a Markov(More)
A COMPARATIVE SIMULATION STUDY OF ROBUST ESTIMATORS OF STANDARD ERRORS Natalie Johnson Department of Statistics Statistics Master of Science The estimation of standard errors is essential to statistical inference. Statistical variability is inherent within data, but is usually of secondary interest; still, some options exist to deal with this variability.(More)
DEVELOPMENT OF INFORMATIVE PRIORS IN MICROARRAY STUDIES Kassandra M. Fronczyk Department of Statistics Master of Science Microarrays measure the abundance of DNA transcripts for thousands of gene sequences, simultaneously facilitating genomic comparisons across tissue types or disease status. These experiments are used to understand fundamental aspects of(More)
lon beam deposition (IRD) has been used to prepare a-SiH, thin films over a -range of deposition conditions. Concentration of hydrogen in the ion beam is found to be a major factor in determining the properties of these materials. Increasing the hydrcgcn concentration of the ion beam from 0 to 75% produces a monotonic decrease in room temperature dark(More)
Editor’s Note: Research is essential to the health and growth of the statistics discipline. The following article discusses some basic strategies for doing and presenting research based on the authors’ experience and conversations with other statisticians. The August 2004 issue of The American Statistician will feature a discussion on the topic “How to do(More)
The biological complexity of gene expression makes simulation of gene expression data difficult. We propose a spike-in simulation that adds a single simulated gene to the data set of interest. Features of this spike-in gene may be manipulated to observe how often the spiked-in gene appears in the list of differentially expressed genes. This approach(More)
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