Factors associated with hunter retrieval of deer hit by arrows and shotgun slugs

Abstract

Hunter retrieval of wounded deer was used as a case study to examine applications and limitations of leisure research for the management of recreational behavior. All hunters receiving permits to hunt in the Shiawassee National Wildlife Refuge during November 1–20, 1983, were sent mail questionnaires. A total of 457 (93 percent) of the archery and 143 (95 percent) of the firearm permittees responded after 3 mailings. Archery deer hunters were estimated to have retrieved 29 (43 percent) of the 68 different deer hit by arrows. Shotgun hunters were estimated to have retrieved 42 (81 percent) of 52 different deer hit. Discriminant analysis showed that the retrieval of deer hit with arrows was most likely when the shooter had tagged a large number of deer during former archery hunts, when the deer was hit in a position other than broadside, and when the range of the shot was short. Deer hit with slugs were more likely to be retrieved when hit by hunters with little experience in tagging deer during former firearm hunts, when the shooter also hunted deer with a bow and arrow, and when the shot was taken at deer that were not running. These data were interpreted to suggest how retrieval rates might be increased through regulation, education, and management of the recreational environment. The role of leisure research and theory in providing techniques and a rationale for modifying the behavior of recreationists is discussed.     

Failure Discrimination and Rating of Enterprises by Semi-Definite Programming

We propose a new method forfailure discrimination and rating of enterprises using financialdata compiled from their balance sheets. No particular distributional assumption is made on the underlying data. Our method automatically discriminates and rates many enterprises using mathematical programming methods. We separate multi-dimensional data byhyperplane and hyper-ellipsoid, so that we can interpretthe results of classification from the geometric point of view. Theproblem to be solved here is a linear programming problem orsemi-definite programming problem which can be solved efficiently byinterior point algorithms. Numerical simulations usingreal data show that hyper-ellipsoid separation generates a result which can be used for practical purposes.     

Classification in automobile insurance using a DEA and discriminant analysis hybrid

In this article, we adopt an efficiency approach to the two-group linear programming method of discriminant analysis (DA), using principles taken from data envelopment analysis (DEA), to predict group membership in an insurance underwriting scheme. Using an empirical insurance data base we illustrate the effectiveness of our model as a decision-making tool to distinguish among automobile insurance applicants by contrasting our hybrid model with both statistical and LP methods of discriminant analysis. We find for this insurance application that our hybrid model significantly outperforms the more traditional methods in separation and misclassification outcomes.     

上市公司制造业财务预警实证研究

选取了2003-2006年上海、深圳交易所A股市场制造业90家财务危机公司和90家所配对的正常公司为样本。选取了能够体现公司四方面业绩的8个指标,通过因子分析和判别分析,建立企业财务预警模型来对公司情况进行预测。预测精度达到83%,所建立的模型具有较好的预测效果。     

中小企业集群债权融资的比较研究

传统中小企业融资和集群内中小企业债权融资的差异.中小企业集群的发展为中小企业融资的改善提供了一种制度基础.单个游离态中小企业融资劣势缘于中小企业信息不透明、抵押品价值偏低、对中小企业融资存在规模不经济等因素.中小企业集群的融资优势表现在拥有更丰富的融资渠道、更低的融资成本、更多的附属选择权.     

What a Waste! A Study of Food Wastage Behavior in Singapore

This study focuses on analyzing food wastage behavior of consumers in Singapore. Qualitative research with experts from food waste management organizations and restaurant operators indicated key reasons for food wastage to be food spoilage, risk of hurting brand due to substandard food, lack of appropriate methods for sorting food, reverse logistics for proper waste collection/disposal, and appropriate recycling facilities. High costs of waste disposal, lack of government incentives or regulations governing service providers, and lack of awareness among consumers also contributed to solid food waste in Singapore. A survey with consumers recorded their habits with regard to planning food purchases, food wastage while cooking, and wastage during consumption of cooked, canned, and ready-to-eat products. A stepwise multiple discriminant analysis done on a key categorical variable “How much effort do you take to minimize amount of uneaten food you throw away?” yielded two groups that differed significantly along several attitudinal/behavioral dimensions.     

The prediction of bankruptcy of small- and medium-sized industrial firms

Using large amounts of data from small- and medium-sized industrial firms, this study examines several aspects of bankruptcy prediction. We have tested a hypothesis on the predictive power of different ratio categories during the successive phases before bankruptcy, and one on the relationship between the age of a firm and the predictability of bankruptcy. It was found that virtually every ratio investigated had some predictive power, and that the univariate and multivariate importance of ratio stability were not very high.     

Logistic Regression, a review

A review is given of the development of logistic regression as a multi-purpose statistical tool.
A historical introduction shows several lines culminating in the unifying paper of Cox (1966), in which theory as developed in the field of bio-assay is shown to be applicable to designs as discriminant-analysis and case-control study. A review is given of several designs all leading to the same analysis. The link is made with epidemiological literature.
Several optimization criteria are discussed that can be used in the case of more observations per cell, namely maximum likelihood, minimum chi-square and weighted regression on the observed logits. Recent literature on the goodness of fit problem is reviewed and finally, comments are made about the non-parametric approach to logistic regression which is still in rapid development.     

波速测试在工程场地判别的应用

波速测试作为岩、土体工程特质测试项目之一,已广泛应用于工业、建筑等诸多领域并取得了良好的实际应用效果。波速测试技术是工程场地判别方法之一,亦是一种简便、快捷、准确的现场管理方法。其利用弹性波在不同弹性介质中的波速差异来获取工程场地判别中岩土体的类型、周期与应用参数,可以为工程场地的判别方法、应用技术、安全性评价提供有价值的参考与依据。