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作者：SOLOW, AR
摘要：Studies of regional climate following volcanic eruptions suggest that explosive volcanism exerts a short-term cooling effect. To understand the effects of explosive volcanism on historic temperatures, it is necessary to identify changes through time in the frequency of explosive eruptions. This article presents an exploratory analysis of a record of explosive eruptions in the Northern Hemisphere over the period 1851-1985. This record is modeled as a nonstationary Poisson process and the intens...
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作者：SCHOTT, JR
摘要：In the application of principal components analysis it is common to replace an observed sample principal component vector by another vector closely resembling the sample vector but which is easier to use or interpret. A useful test of hypothesis in this case is one that specifies the true ith principal component. In this article we obtain an asymptotically chi-squared procedure suitable for testing such a hypothesis when the principal components analysis is performed on a correlation matrix. T...
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作者：FABIAN, V
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作者：FAULKENBERRY, GD; GAROUI, A
作者单位：Oregon State University; Universite de Carthage
摘要：Land segments form the sampling frame in a variety of sampling problems. In this article, the class of linear homogeneous estimators is investigated for the area sampling frame used in agricultural surveys. It is shown that the commonly used estimators belong to this class, and results are obtained comparing these estimators with other estimators in the class. In previous work in agriculture surveys where the problem is to estimate the population total using an area sampling frame, the estimat...
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作者：ROCKWELL, RC
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作者：ANDERSEN, EB
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作者：MULRY, MH; SPENCER, BD
作者单位：Northwestern University
摘要：We describe a methodology for estimating the accuracy of dual systems estimates (DSE's) of population, census estimates of population, and estimates of undercount in the census. The DSE's are based on the census and a post-enumeration survey (PES). We apply the methodology to the 1988 dress rehearsal census of St. Louis and east-central Missouri and we discuss its applicability to the 1990 census and PES. The methodology is based on decompositions of the total (or net) error into components, s...
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作者：KARLIN, S; MACKEN, C
摘要：The fields of molecular genetics and medicine are accumulating DNA and protein sequence data at an accelerating rate. Discovering and interpreting sequence patterns can contribute to understanding molecular mechanisms and evolutionary processes. This article considers two types of statistical problems in these contexts: (1) identifying anomalies in the distribution of a specified biochemical marker along a DNA string; in particular, new statistical methods are set forth by which to assess exce...
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作者：MORETTIN, PA
作者单位：Universidade de Sao Paulo
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作者：CHANG, WC; WEISS, DE
作者单位：Northern Illinois University
摘要：Understanding the stochastic behavior of beta is fundamental to portfolio risk management. We evaluate the time series properties of beta for oil industry stocks, machinery industry stocks, and a random sample of 100 stocks. Daily returns for stocks in each of these industries and the random sample are obtained from the Center for Research in Security Prices tapes for the period July 1962 through December 1986 and are grouped into 98 quarter-year, and also 49 half-year, nonoverlapping time int...
