A comparison of robust regression techniques for the estimation of weibull parameters

In this paper several alternative robust reqression techniques are compared for estimating parameters of a Weibull distribution . In addition to the usual least squares (L₂) and least absolute deviation (L₁) methods, a number of one-step reweighting schemes based on the L₁residuals are considered. The results of an extensive series of Monte Carlo simulation experiments demonstrate that the Anscmbe reweighting scheme generally produces the best Weibull estimates over the range of sample sizes and parameter values studied.     

Sexual fantasies among married males: An analysis of sexual satisfaction,situational contexts,and functions (1)

The purposes of this empirical study were to determine the relationship, if any, between sexual fantasies and sexual satisfaction as well as the functions of sexual fantasies for married males. From a structural‐functionalism perspective, a questionnaire was developed and pretested for this exploratory study of sexual fantasies. An anonymous questionnaire was administered to 840 undergraduate and graduate student volunteers at a midwestern commuter university. These analyses are restricted to a subsample of 127 married males contained in the original sample. While many authorities have argued that engaging in sexual fantasies may be undesirable, the findings in this study do not support that conclusion.     

Indigenous Religions in the United States

Delving into the life and legacy of Henry VIII is both complex and captivating. People seem compelled to learn more abut his critical contributions and controversial conduct that range from the significant to the scandalous. Reflecting on the history of the world would be incomplete without investigating the events and escapades associated with Henry VIII, whose impact of 500 years ago resonates through today's society and into the future through literature, music, politics, and religion. To view the many facets of Henry VIII, classroom teachers and their students are encouraged to use graphic organizers to provide easy-to-understand visualizations. Eight types of graphic organizers engage learners in student-centered activities that help students make meaning from and show relationships among the diverse attributes of Henry VIII. When combined, the eight graphic organizers equip learners with valuable tools to construct a holistic examination about the history of Henry VIII.     

Claiming Competence: Biographical Work among Victim‐Advocates and Counselors

Advocates and counselors at agencies that assist victims of domestic violence and sexual assault argue that they are especially suited to help their clients develop safe and practical strategies to protect themselves from further abuse. Yet the backstage of these agencies can depict a reality of confusion, doubt, and sometimes fear—especially when clients’ cases do not go according to plan. Data collected from in‐depth interviews and participant observation over fourteen months show how advocates and counselors engaged in “biographical work” (Gubrium and Holstein 2000) to construct coherent and consistent narratives as competent service providers in the aftermath of their clients’ unanticipated outcomes. Calling on different discursive strategies accessible to them according to their position within the agency, both groups were able to interpret negative results as beyond their responsibility. However, the counselor's rhetoric of “professionalism” proved more effective in this regard compared with the advocates’ “empowerment.”     

Probability inequalities for continuous unimodal random variables with finite support

A paramecer-free Bernstein-type upper bound is derived for the probability that the sum S of n i.i.d, unimodal random variables with finite support, X₁ ,X₂,…,X_n, exceeds its mean E(S) by the positive value nt. The bound for P{S - nμ ≥ nt} depends on the range of the summands, the sample size n, the positive number t, and the type of unimodality assumed for X_i. A two-sided Gauss-type probability inequality for sums of strongly unimodal random variables is also given. The new bounds are contrasted to Hoeffding's inequality for bounded random variables and to the Bienayme-Chebyshev inequality. Finally, the new inequalities are applied to a classic probability inequality example first published by Savage (1961).     

A note on the connectivity of generalized cyclic designs

A necessary and sufficient condition is given to ensure that a generating blook of a generalized cyclic design will give rise to a connected design. The use of disconnected designs is briefly discussed.     

Low species richness of non-biting midges (Diptera: Chironomidae) in Neotropical artificial urban water bodies

Chironomid assemblages of 22 artificial water bodies, mainly fountains, in two South American cities were surveyed. We found surprisingly low diversities, with a total of 11 taxa, averaging two taxa per site. The typical fountain assemblages mainly consisted of common species that have a wide distribution pattern and are tolerant to organic pollution. Also taxa independent of the natural aquatic sources, such as tap-water and semi-terrestrial species were represented. There was no significant difference between the taxa richness of the two S. American regions, however, the assemblage structures of the water bodies of Quito and Bogotá differed significantly. There was no correlation between sample similarities and distances among the sites either. The low number of taxa recorded can be attributed to the combination of naturally limited species pool and the heavy pollution in natural water bodies as colonization sources.     

Bayesian inference for comparing two Poisson rates using data subject to underreporting and validation data

We derive a new Bayesian credible interval estimator for comparing two Poisson rates when counts are underreported and an additional validation data set is available. We provide a closed-form posterior density for the difference between the two rates that yields insightful information on which prior parameters influence the posterior the most. We also apply the new interval estimator to a real-data example, investigate the performance of the credible interval, and examine the impact of informative priors on the rate difference posterior via Monte Carlo simulations.