期刊：
Suicide and Life-Threatening Behavior,2016年46(4):447-456 ISSN：0363-0234
通讯作者：
Karras, Elizabeth
作者机构：
[Karras, Elizabeth; Tu, Xin M.; Stephens, Brady] US Dept Vet Affairs, VISN Ctr Excellence Suicide Prevent 2, 400 Ft Hill Ave, Canandaigua, NY 14424 USA.;[Karras, Elizabeth; Tu, Xin M.] Univ Rochester, Dept Psychiat, Rochester, NY USA.;[Tu, Xin M.; Lu, Naiji] Univ Rochester, Dept Biostat & Computat Biol, Rochester, NY USA.;[Zuo, Guoxin] Cent China Normal Univ, Sch Math & Stat, Wuhan, Peoples R China.;[Draper, John] Link2Hlth Solut Inc, Natl Suicide Prevent Lifeline, New York, NY USA.
通讯机构：
[Karras, Elizabeth] U;US Dept Vet Affairs, VISN Ctr Excellence Suicide Prevent 2, 400 Ft Hill Ave, Canandaigua, NY 14424 USA.
摘要：
Campaigns have become popular in public health approaches to suicide prevention; however, limited empirical investigation of their impact on behavior has been conducted. To address this gap, utilization patterns of crisis support services associated with the Department of Veterans Affairs' Veterans Crisis Line (VCL) suicide prevention campaign were examined. Daily call data for the National Suicide Prevention Lifeline, VCL, and 1-800-SUICIDE were modeled using a novel semi-varying coefficient method. Analyses reveal significant increases in call volume to both targeted and broad resources during the campaign. Findings underscore the need for further research to refine measurement of the effects of these suicide prevention efforts.
期刊：
Insurance: Mathematics and Economics,2014年59(Nov.):325-336 ISSN：0167-6687
通讯作者：
Li, Bo
作者机构：
[Li, Bo; Zhang, Huiming] Cent China Normal Univ, Dept Math & Stat, Wuhan 430079, Peoples R China.;[Liu, Yunxiao] Univ N Carolina, Dept Stat & Operat Res, Chapel Hill, NC 27599 USA.
通讯机构：
[Li, Bo] C;Cent China Normal Univ, Dept Math & Stat, Wuhan 430079, Peoples R China.
关键词：
Compound Poisson distribution;Integer-valued Levy process;CreditRisk plus model;Geometric Brownian motion with jumps;Pseudo compound Poisson distribution;Wiener-Levy theorem
摘要：
Probability generating function (p.g.f.) is a powerful tool to study discrete compound Poisson (DCP) distribution. By applying inverse Fourier transform of p.g.f., it is convenient to numerically calculate probability density and do parameter estimation. As an application to finance and insurance, we firstly show that in the generalized CreditRisk+ model, the default loss of each debtor and the total default of all debtors are both approximately equal to a DCP distribution, and we give Le Cam's error bound between the total default and a DCP distribution. Next, we consider geometric Brownian motion with DCP jumps and derive its rth moment. We establish the surplus process of the difference of two DCP distributions, and numerically compute the tail probability. Furthermore, we define the discrete pseudo compound Poisson (DPCP) distribution and give the characterizations and examples of DPCP distribution, including the strictly decreasing discrete distribution and the zero-inflated discrete distribution with P(X = 0) > 0.5. (C) 2014 Elsevier B.V. All rights reserved.
摘要：
This paper presents the results obtained from a study comparing the strategies used by 1,070 Chinese students and 1,002 Singaporean students from primary grade 6 to secondary year 2 in solving three fraction-related problems. It is part of the author's Ph.D. study, which involves more word problems on speed. The Chinese students performed better than the Singaporean students on two of the three problems, while the Singaporean students performed better than the Chinese students on the other. The strategy analyses reveal that the Chinese students used the traditional methods like arithmetic and algebraic strategies more frequently than the Singaporean students, whereas the Singaporean students used the model and unitary methods more frequently than the Chinese students. Implications for the teaching and learning of word problems on speed, as well as problem solving, are also provided.
