Lowering Inventory Systems Costs by Using Regression-Derived Estimators of Demand Variability*

Scientific techniques for inventory management typically are applied to systems containing many items. Such techniques require an estimation of the demand variance (and mean) of each item from historical data. This research demonstrates a significant potential for improvement in system cost performance from using least-squares regression fits of a variance-to-mean functional relation instead of the standard statistical variance estimate. Even when there is a moderate degree of heterogeneity among items and when the form of the variance-to-mean relation is misspecified, substantial cost savings may be realized. The cost of statistical uncertainty may be reduced by half. The research also provides evidence that system cost is fairly insensitive to the number of items used to fit the regression. This paper provides the underlying reason why a regression-derived variance estimator yields lower cost: it is less variable than the usual individual item variance estimator.     

A Preliminary Study on the Effectiveness of the Chinese Career Key Online

The Chinese Career Key (CCK) Online was studied for its effectiveness and user satisfaction. Study participants were 92 students at a public high school in Hong Kong. The research findings provide preliminary evidence of reliability, validity, and user satisfaction for the CCK Online. Limitations and implications for future studies and counseling practice across cultures are discussed.     

Who is leading the campaign charts? Comparing individual popularity on old and new media

Attention in the mass media is seen as crucial for electoral success. However, most ordinary candidates hardly get any attention in the news. With social media outlets becoming ever more popular, the question is whether the overall asymmetry in attention for candidates still holds today. Do candidates who dominate the traditional media during the campaign also dominate the social media? Or can candidates make up for a lack of mass media coverage by attracting attention on these new media platforms? This paper aims to answer these questions by pairing Twitter activity and Twitter popularity with newspaper attention for a large number of individual candidates in the 2014 Belgian election campaign. We expand the normalization versus equalization debate by not only looking at how much a new medium is used, but also at its success in terms of popularity and audience reach. Our findings show that the two platforms are indeed related, mainly because a small political elite dominates both old and new media. Twitter popularity and Twitter activity (albeit to a lesser extent) are higher among powerful politicians. We elaborate on why these findings are so much in line with the normalization hypothesis.     

Commentary on “Critical Flaws in the FSFI and IIEF”

This invited commentary responds to recent criticisms of two validated and widely used sexual function questionnaires, the Female Sexual Function Index (FSFI) and the International Index of Erectile Function (IIEF) (Forbes, Baillie, &; Schniering, 2014 Forbes , M. K. , Baillie , A. J. , &; Schniering , C. A. ( 2014 ). Critical flaws in the Female Sexual Function Index and the International Index of Erectile Function . Journal of Sex Research , 51 , 485 – 491 . doi: 10.1080/00224499.2013.876607 [Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]). We take issue with the conceptual arguments presented, selective review of published literature on both instruments, and conclusions drawn from methodologically flawed findings from an Internet-based study in a nonrepresentative group of Australian men and women. Alternative perspectives on the IIEF and FSFI are presented.     

Father's Incarceration and Youth Delinquency and Depression: Examining Differences by Race and Ethnicity

This article examines associations between biological father's incarceration and internalizing and externalizing outcomes of depression and serious delinquency, across White, Black, and Hispanic subsamples of youth in the National Longitudinal Study of Adolescent Health. Among respondents whose father was first incarcerated during childhood or adolescence, father's incarceration is found to be associated with increased depression and delinquency. On the whole, results indicate that associations between father's incarceration and depression and delinquency do not vary by race and ethnicity or gender. One exception is among Hispanic respondents, for whom having a biological father incarcerated is associated with an even higher propensity of delinquency than among White and Black respondents with incarcerated fathers.     

Suicide,Religion, and Latinos: A Macrolevel Study of U.S. Latino Suicide Rates

Since the publication of Durkheim's Suicide more than a century ago, researchers have been examining the relationship between religion and suicide, and race/ethnicity and suicide. However, no study has examined how religion influences U.S. Latino suicide rates. This study fills a gap in the literature by applying three competing theses to the study of Latino suicide. Results show that (1) religious contextual variables significantly affect Latino suicide rates, (2) U.S.‐born Latinos benefit from religious communities, regardless of denomination or measurement used, and (3) foreign‐born Latinos only benefit from Catholic adherents and homogeneity.     

A Problematic Test of the Kin Selection Hypothesis Among the Urak-Lawoi of Ko Lipe,Thailand: Commentary on Camperio Ciani,Battaglia, and Liotta (2015)

Camperio Ciani et al. argued that the Urak-Lawoi people of Ko Lipe island live in a “traditional,” “subsistence primitive society” reminiscent of the “ancestral” human past and that their socio-cultural situation is “remarkably similar” to Samoa. On this basis, they asserted that the Ko Lipe Urak-Lawoi are an appropriate population for determining the role that kin selection played in the evolution of male androphilia. The purpose of this commentary is to outline some of our concerns with this characterization and with the statistical analyses conducted by Camperio Ciani et al. in their study of the Urak-Lawoi.     

EMPIRICAL AND JUDGMENT-BASED SALES-FORCE DECISION MODELS: A COMPARATIVE ANALYSIS*

Multiple-predictor empirical and single-predictor judgment-based models represent the two basic types of sales-force decision models (SDMs). The important similarities and differences between the two modeling approaches are identified and discussed. The SDM literature is reviewed to determine how each model type has been applied and to evaluate previous attempts at model validation. A research study designed to compare the normative sales-call allocations generated from each modeling approach is presented. Study results indicate that empirical and judgment-based SDMs would produce similar normative guidelines. The implications of this finding are discussed.     

Associations among Maternal Behavior,Delay of Gratification,and School Readiness across the Early Childhood Years

This study examined the developmental pathways from maternal behavior to school readiness within a sample of 1007 children, with a specific focus on the mediating role of delay of gratification (DoG). Maternal behavior across the first 36 months of age was explored as a predictor of children's DoG at 54 months as well as their behavioral and academic competence in kindergarten. Results support sensitivity as a predictor of children's DoG and indicate significant associations between DoG and teacher‐reported externalizing behavior, social skills, and academic skills. Moreover, DoG partially mediated the associations between maternal sensitivity and school readiness skills, with the highest percentage of mediation reported for social skills. Findings indicate maternal sensitivity and DoG as potential targets for efforts aimed at enhancing school readiness among young children.