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This paper reports on a simulation comparison of scale estimators for symmetric stable distributions in terms of their ability to identify the population with the greater scale. The modified geometric mean is found to be superior to the sample standard deviation and the Fama-Roll estimator for the larger values of the characteristic exponent, while the Fama-Roll estimator is judged superior for the smaller values. Further, this study sheds some light on the question of the appropriate sample size for discriminating risk measurement in investment analysis when the samples are taken from symmetric stable distributions. 相似文献
576.
This study is mainly concerned with estimating a shift parameter in the two-sample location problem. The proposed Smoothed Mann–Whitney–Wilcoxon method smooths the empirical distribution functions of each sample by using convolution technique, and it replaces unknown distribution functions F(x) and G(x ? Δ0) with the new smoothed distribution functions F s (x) and G s (x ? Δ0), respectively. The unknown shift parameter Δ0 is estimated by solving the gradient function S n (Δ) with respect to an arbitrary variable Δ. The asymptotic properties of the new estimator are established under some conditions that are similar to the Generalized Wilcoxon procedure proposed by Anderson and Hettmansperger (1996). Some of these properties are asymptotic normality, asymptotic level confidence interval, and hypothesis testing for Δ0. Asymptotic relative efficiency of the proposed method with respect to the least squares, Generalized Wilcoxon and Hodges and Lehmann (1963) procedures are also calculated under the contaminated normal model. 相似文献
577.
For the past decade low cost computer graphics terminals have consisted almost exclusively of direct view storage tube (DVST) devices. Recently, however, a new variety of terminal based on “raster TV technology” has emerged which is competitive with storage tubes in price and readily supports variable intensity and color. We summarize the basic organization of raster terminals so as to indicate their capabilities, discuss their advantages and disadvantages, and illustrate some of their uses in statistics and elsewhere. Because color is almost universally available on these terminals, we also discuss some elementary principles of color perception and use. An understanding of this material will help the data analyst present data effectively. 相似文献
578.
Principles of Biostatistics. Marcello Pagano and Kimberlee Gauvreau. Belmont, CA: Duxbury, 1993. xviii + 524 pp. + disk. $53.25. Reviewed by Todd G. Nick 相似文献
579.
Alan Agresti Section Editor 《The American statistician》2013,67(2):237-239
Statistics: Learning in the Presence of Variation Robert L. Wardrop. Dubuque, IA: Wm. C. Brown Publishers, 1995. xxiv + 662 pp. $63.80. Reviewed by Allan J. Rossman Modeling Experimental and Observational Data Clifford E. Lunneborg. Belmont, CA: Duxbury Press, 1994. xv + 506 pp. $40.95. Reviewed by Mark S. Handcock Probability and Statistics for Engineers Richard Scheaffer and James T. McClave. Belmont, CA: Duxbury Press, 1995. xiv + 745 pp. $66.00. Reviewed by Gary D. Herrin 相似文献
580.
Although researchers have begun to examine the issue of ethnic and cultural factors in childhood sexual abuse (CSA), relatively little has been done to look at possible ethnic and cultural differences in psychological symptoms related to CSA. This study investigated the relationship between ethnicity and symptom presentation among Hispanic, African American, and Caucasian sexually abused girls. The study examined the relationship between ethnicity and depression, ethnicity and post-trauma intrusive symptoms, and ethnicity and post-trauma avoidance symptoms. Results indicated that African American girls had significantly higher levels of post-trauma avoidance symptoms than Hispanic girls, but not Caucasian girls. No significant differences were found between ethnic groups for depression or intrusive symptoms. 相似文献