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141.
Roger B. Trent 《Population and environment》1980,3(3-4):309-327
George Gallup polled "ideal family size" in 1936 and introduced a concept which subsequently appeared in many polls and fertility surveys. Previous research shows that ideal is a poor measure of respondent's personal fertility plans or behavior and that among researchers there is little agreement about what ideal family size does measure, if anything. Construct validity analysis based on historical, trend, and cross-sectional data suggests that the late 1960s saw ideal politicized as preoccupation with the "population problem" grew. Ideal family size is now appropriately regarded as a measure of a societal pronatalist norm and not merely a projected fertility preference.A version of this paper was presented at the meetings of the Society for Applied Anthropology, Merida, Mexico, 5 April 1978. Data on ideal family size from Blake (1974) are used with permission of the editors ofDemography. Other data come from the 1965 and 1970 National Fertility Studies co-directed by N.B. Ryder and C.F. Westoff (under contract No. PH-43-65-1048 with the National Institute of Child Health and Human Development). 相似文献
142.
This study investigates the impact of the earthquake that occurred on May 12, 2008 in Sichuan, China on stressed families already experiencing domestic violence. We hypothesized that cumulative postdisaster stress would increase marital aggression and that the well-being of victims would deteriorate following the quake. A total of 186 women were recruited for this study. Results show that all types of family violence, including psychological aggression and physical violence between partners, increased after the earthquake. We provided preliminary evidence that psychological aggression was significantly associated with the detrimental effects on victims' mental and physical functioning. The findings support the need for violence assessment among victims of earthquakes, and we recommend that violence prevention be considered as part of the intervention during such natural disasters. 相似文献
143.
The term ‘end-to-end’ process management is now commonplace in the language and practice of operations. Managers are encouraged to migrate from functional process management to end-to-end process management to realise a range of performance improvements. However, these improvements are often elusive; the specific challenges associated with such a migration are under-researched. This paper uses a cross-sector study to identify the challenges of end-to-end process management and to generate practical managerial guidance. Three areas are identified that demand particular managerial attention: the need to move beyond process mapping, the role of IT in process management and maintaining the process infrastructure as a strategic asset. More significantly, the findings highlight the need for greater conceptual clarity regarding the end-to-end concept itself. The existing literature suggests that scope is the primary differentiator of the end-to-end process – the requirement to manage an extended boundary from customer order through to customer fulfilment. However, this research suggests that the end-to-end concept is more complex, comprising of three core constructs with seven dimensions: scope (boundary conditions, sequence/flow and controls); scale (resources and input/output transformation) and complexity (interrelationships and orientation). End-to-end process management involves much more than an extended boundary. It requires a systemic perspective and clarity regarding controls and transforming resources. 相似文献
144.
Juan Feng Zuo‐Jun Max Shen Roger Lezhou Zhan 《Production and Operations Management》2007,16(4):510-522
We study auctions for a set of commonly‐ranked items where each buyer has unit demand. This setting has promising applications in areas such as keyword auctions in the search engine advertising industry, the sale of quality‐ranked raw materials, etc. An auction mechanism suitable for this setting is the simultaneous pooled auction (SPA), where each bidder simultaneously submits a single bid and is allocated an object based on the rank of his bid among all the bids. We study how to improve the seller's expected revenue by enforcing a reserve price in an SPA. We find that the use of an appropriate reserve price may significantly increase the seller's revenue, especially when the number of items for sale is relatively large compared to the number of participating bidders. One inherent problem in the SPA is that some bidders may incur ex post losses; that is, they pay more than what they value the received objects. We propose a tailored VCG mechanism that generates the same expected revenue as the SPA does, while bidders do not incur any ex post loss. We also discuss the potential applications of this research to keyword auctions. 相似文献
145.
It has long been known that for many joint distributions exhibiting weak dependence, the sample value of Spearman's rho is about 50% larger than the sample value of Kendall's tau. We explain this behavior by showing that for the population analogs of these statistics, the ratio of rho to tau approaches 3/2 as the joint distribution approaches that of two independent random variables. We also find sufficient conditions for determining the direction of the inequality between three times tau and twice rho when the underlying joint distribution is absolutely continuous. 相似文献
146.
Scott E. Rutledge Roger A. Roffman Christine Mahoney Joseph F. Picciano James P. Berghuis Seth C. Kalichman 《Clinical Social Work Journal》2001,29(3):291-306
Motivational enhancement therapy (MET) interventions are being increasingly added to the menu of behavioral interventions for HIV prevention. They present few logistical and psychological barriers for at-risk persons who are ambivalent about transmission risk reduction and appear to offer promise of being transferable to community based organizations and public health programs. We describe the principles of motivational interviewing, a counseling style often used in conjunction with MET, and demonstrate and discuss its application with case examples drawn from a recent pilot trial of a telephone-delivered brief motivational enhancement for HIV risk reduction with men who have sex with men (MSM). 相似文献
147.
148.
Measurement of non-randomness in spatial distributions 总被引:4,自引:0,他引:4
Roger H. Green 《Researches on Population Ecology》1966,8(1):1-7
Summary The measurement of departure from randomness in spatial distributions has widespread application in ecological work. Several
“indices of non-randomness” are compared with regard to their dependence on sample number, sample size and density. Criteria
for the best choice of index for specific situations are discussed. A new coefficientC
x is proposed for use with positively contagious distributions and tests of significance are given. WhenC
x and another index (S
2/m−1) are used for positive and negative contagion respectively, values ranging from −1 through 0 (random) to +1 are obtained,
regardless of sample number, sample size or density. 相似文献
149.
This paper discusses the relationship between uncertainty in a decision making environment and the desired characteristics of information used for decision making. The work is aimed at providing a better understanding of the variables that affect the design of Management Information Systems. An experiment was conducted using an inventory simulator. The subjects could decide on inventory control variables and the amount and type of information to be used in monitoring system performance. The demand for inventory was an external random variable under the control of the experimenter. The experiment investigated how different demand variances affected the decision information used, the decisions made, and the resulting decision effectiveness (cost.) It was found that decision review frequency was not affected by demand variability. However, age and degree of summary of information used were greatly affected. Subjects exposed to high variability used data with a shorter history and a higher level of detail than those exposed to low variability. It was also found that the number of reports used increased from the low to middle variance group, then decreased at very high variance. Subjects tended to “give-up” on their information system at high variance, and they relied on additional safety stock to prevent frequent stockouts. Finally, the correlation between the information used and decision effectiveness as measured by cost was low. This result was contrary to the subjects' beliefs that more and better information produced “better” decisions. It indicates that although variability may strongly affect preferences for different types of information, the information used may not in turn affect decision performance. 相似文献
150.
In the past most inventory formulations have utilized cost minimization or profit maximization as an optimizing criterion. When viewed from the standpoint of the owner or investor, maximizing the return on investment (ROI) is an appropriate criterion for many types of inventories. This paper proposes ROI as a criterion for inventory models and derives optimal reorder rules for some common assumptions. An economic order quantity that differs greatly from the traditional formulas is discussed. The paper also enumerates the conditions under which ROI is an appropriate criterion and contrasts it to the traditional cost minimization and profit maximization criteria. 相似文献