用封闭法原理研究测量跨距与精度之关系

本文运用封闭法测量原理研究在不同跨距下，自准直仪，合象水平仪的测量方法误差，通过回归分析法求出跨距与权之关系，为不等精度测量提供依据。     

EStimating mahalanobis's distance using bayesian analysis

In this paper we are concerned with the problem of estimating Mahalanobis's distance between two or more populations using Bayesian approach. We first consider the case of two independent univariate normal populations having a common variance. We derive the posterior distribution of the     

Optimal sample size allocation for multi-level stress testing with Weibull regression under Type-II censoring

We discuss the optimal allocation problem in a multi-level stress test with Type-II censoring and Weibull (extreme value) regression model. We derive the maximum-likelihood estimators and their asymptotic variance–covariance matrix through the Fisher information. Four optimality criteria are used to discuss the optimal allocation problem. Optimal allocation of units, both exactly for small sample sizes and asymptotically for large sample sizes, for two- and four-stress-level situations are determined numerically. Conclusions and discussions are provided based on the numerical studies.     

Assessing Profitability of a Newsboy-Type Product with Normally Distributed Demand Based on Multiple Samples

This article develops a new index “Achievable Capacity Index,” I _A , which can accurately measure the profitability of newsboy-type product with normally distributed demand. An unbiased and effective estimator of I _A is derived to estimate actual I _A as the parameters of distribution are unknown. Practically, the market information regarding demand is obtained from multiple samples rather than single sample. Therefore, we estimate and test I _A based on multiple samples. A hypothesis testing for examining whether the profitability meets designated requirement is presented. Critical values of the test are calculated to determine the evaluation results. Finally, a real case on the sales of donuts is presented to illustrate the applicability of our approach.     

A DSM-5-Based Online Mental Health Referral Inventory: A Large-Scale Validation Study

In 2007, a comprehensive mental health referral inventory based on the 4th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) was posted online as an alternative to the informal tests the public now uses to self-diagnose mental health problems. A validation study was published in 2011 (Epstein &; Muzzatti, 2011 Epstein, R., &; Muzzatti, L. (2011). Preliminary validation of an online DSM-based mental health referral inventory. Journal of Technology in Human Services, 29, 284–295. doi:10.1080/15228835.2011.638421[Taylor &; Francis Online] , [Google Scholar]). In 2013, a revision of that inventory that was consistent with the DSM-5 was posted. The present study evaluates the new inventory with a diverse sample of 201,625 people from 184 countries (mainly the United States, Canada, and the United Kingdom). The 63-item inventory screens for 21 common problems and typically takes about 5?min to complete. Test scores proved to be good predictors of a variety of self-reported criterion measures, including happiness, personal and professional success, history of hospitalization, history of therapy, current participation in therapy, and employment. Females were found to have slightly more mental health problems than males, and effects were also found for education and race/ethnicity. The revised test is more accessible than the original, reducing the reading level from grade 10.2 to 6.6. It is not designed to diagnose; rather, its primary purpose is to refer people to mental health professionals for further evaluation. It can also be used in clinical settings for quick screening purposes.     

Generalized Holm’s procedure for multiple hypotheses testing problems

A generalized Holm’s procedure is proposed which can reject several null hypotheses at each step sequentially and also strongly controls the family-wise error rate regardless of the dependence of individual test statistics. The new procedure is more powerful than Holm’s procedure if the number of rejections m and m > 0 is prespecified before the test.     

Rates of Asymptomatic Nonurethral Gonorrhea and Chlamydia in a Population of University Men Who Have Sex With Men

ABSTRACT

Objective: To evaluate a text message (SMS) program as a booster to an in-person alcohol intervention with mandated college students. Participants: Undergraduates (N = 224; 46% female) who violated an on-campus alcohol policy over a 2-semester period in 2014. Methods: The SMS program sent drinking-related queries each Thursday and Sunday and provided tailored feedback for 6 weeks. Response rates to SMS drinking-related queries and the associations between weekend drinking plans, drinking-limit goal commitment, and alcohol consumption were examined. Gender differences were explored. Results: Ninety percent of SMS queries were completed. Weekend binge drinking decreased over 6 weeks, and drinking-limit goal commitment was associated with less alcohol consumption. Compared with women, men had greater reductions in alcohol consumption when they committed to a drinking-limit goal. Conclusions: Preliminary evidence suggests that an SMS program could be useful as a booster for helping mandated students reduce weekend binge drinking.     

Independence and Dependence in Aging

No abstract available for this article.     

A discussion of the question: for what use are tests of hypotheses and tests of significance

The author believes that tests provide a poor model of most real problems, usually so poor that their objectivity is tangential and often too poor to be useful.