The gender asymmetric effect of intimate partner violence on relationship satisfaction

Our research examined the association between intimate partner violence and relationship satisfaction among victims. The negative association between victimization and relationship satisfaction was substantially stronger for females than for males. Comparisons between respondents reporting about same-sex relationships with those reporting about opposite-sex relationships provided evidence that the amplified victimization/satisfaction association among female victims is a victim-gender effect rather than an actor-gender effect. In other words, our findings suggest that aggression harms the quality of the intimate partnerships of females much more so than the partnerships of males regardless of whether a male or a female is the perpetrator. We supplemented dialogue about the direct implications of our findings with discussions about how these results may raise conceptual questions about the adequacy of the instruments scholars use to study partner aggression.     

A note on the measurement of accuracy for subnational demographic estimates

Mean absolute percentage error (MAPE), the measure most often used for evaluating subnational demographic estimates, is not always valid. We describe guidelines for determining when MAPE is valid. Applying them to case study data, we find that MAPE understates accuracy because it is unduly influenced by outliers. To overcome this problem, we calculate a transformed MAPE (MAPE-T) using a modified Box-Cox method. Because MAPE-T is not in the same scale as the untransformed absolute percentage errors, we provide a procedure for calculating MAPE-R, a measure in the same scale as the original observations. We argue that MAPE-R is a more appropriate summary measure of average absolute percentage error when the guidelines indicate that MAPE is not valid.     

What is child protection? Historical and methodological issues in comparative research on lastensuojelu/child protection

This article addresses comparative research on what has come to be called, in (British) English, 'child protection' or, rather differently, in Finnish ' lastensuojelu '. In developing a cross-national research project on lastensuojelu /child protection practices in England and Finland, we found it necessary to go back a few steps, to address what might usually be considered as 'background issues'. This article discusses the welfare state traditions in both countries, especially with respect to families and children, in order to contextualise the focus of ongoing qualitative research on micro comparisons. When comparing the mundane practices of child protection and the ways problems and clienthoods are constructed, as in this study, historical, social, cultural and linguistic issues matter. Indeed, very basic concepts such as 'child protection' and 'child protection case' become problematic in the comparison.     

Importation,SES-selective acculturation,and the weaker SES-health gradients of Mexican immigrants in the United States

Previous studies find U.S. immigrants have weaker socioeconomic gradients in health relative to non-Hispanic Whites and their U.S.-born co-ethnics. Several explanations have been advanced but few have been tested empirically. We use data from the Mexican Family Life Survey and the U.S. National Health Interview Survey, including longitudinal data in the former measuring socioeconomic status (SES) and health previous to emigration, to test if (1) immigrants “import” their gradients from the sending country, or if (2) they may be changing as a result of SES-graded acculturation among Mexican migrant men in two health indicators: obesity and current smoking. We find evidence consistent with the first hypothesis: the gradients of migrants measured prior to coming to the U.S. are not statistically different from those of nonmigrants, as the gradients of each are relatively weak. Although the gradients for obesity and smoking appear to weaken with time spent in the U.S., the differences are not significant, suggesting little support for the selective acculturation hypothesis.     

Exact Inference for a Population Proportion Based on a Ranked Set Sample

ABSTRACT

This article develops and investigates a confidence interval and hypothesis testing procedure for a population proportion based on a ranked set sample (RSS). The inference is exact, in the sense that it is based on the exact distribution of the total number of successes observed in the RSS. Furthermore, this distribution can be readily computed with the well-known and freely available R statistical software package. A data example that illustrates the methodology is presented. In addition, the properties of the inference procedures are compared with their simple random sample (SRS) counterparts. In regards to expected lengths of confidence intervals and the power of tests, the RSS inference procedures are superior to the SRS methods.     

Moments and quadratic forms of matrix variate skew normal distributions

ABSTRACT

In 2007, Domínguez-Molina et al. obtained the moment generating function (mgf) of the matrix variate closed skew normal distribution. In this paper, we use their mgf to obtain the first two moments and some additional properties of quadratic forms for the matrix variate skew normal distributions. The quadratic forms are particularly interesting because they are essentially correlation tests that introduce a new type of orthogonality condition.     

A simple way to deal with multicollinearity

Despite the long and frustrating history of struggling with the wrong signs or other types of implausible estimates under multicollinearity, it turns out that the problem can be solved in a surprisingly easy way. This paper presents a simple approach that ensures both statistically sound and theoretically consistent estimates under multicollinearity. The approach is simple in the sense that it requires nothing but basic statistical methods plus a piece of a priori knowledge. In addition, the approach is robust even to the extreme case when the a priori knowledge is wrong. A simulation test shows astonishingly superior performance of the method in repeated samples comparing to the OLS, the Ridge Regression and the Dropping-Variable approach.     

Reanalysis of Dose-Response Data from the Iraqi Methylmercury Poisoning Episode

Applying a hockey stick parametric dose-response model to data on late or retarded development in Iraqi children exposed in utero to methylmercury, with mercury (Hg) exposure characterized by the peak Hg concentration in mothers'hair during pregnancy, Cox et al. calculated the "best statistical estimate" of the threshold for health effects as 10 ppm Hg in hair with a 95% range of uncertainty of between 0 and 13.6 ppm.⁽¹⁾A new application of the hockey stick model to the Iraqi data shows, however, that the statistical upper limit of the threshold based on the hockey stick model could be as high as 255 ppm. Furthermore, the maximum likelihood estimate of the threshold using a different parametric model is virtually zero. These and other analyses demonstrate that threshold estimates based on parametric models exhibit high statistical variability and model dependency, and are highly sensitive to the precise definition of an abnormal response. Consequently, they are not a reliable basis for setting a reference dose (RfD) for methylmercury. Benchmark analyses and statistical analyses useful for deriving NOAELs are also presented. We believe these latter analyses—particularly the benchmark analyses—generally form a sounder basis for determining RfDs than the type of hockey stick analysis presented by Cox et al. However, the acute nature of the exposures, as well as other limitations in the Iraqi data suggest that other data may be more appropriate for determining acceptable human exposures to methylmercury.     

Changing faces: the story of two Canadian street youth shelters

This study addresses the relationship between street youth shelters and formal child welfare systems in Toronto, Canada. Two case examples, Covenant House (CH) and Youth Without Shelter (YWS), are examined through archival material, participant observations and structured interviews with 21 front-line and managerial shelter workers. The findings suggest that both shelters have formed reciprocal and unequal partnerships with formal child-welfare organisations. The consequences of such an arrangement are threefold: (1) CH and YWS no longer possess an internal environment to support traditional street youths; (2) both shelters have strayed from their original intentions; and (3) many shelter workers express frustration within this dynamic. Several recommendations are put forward to support the survival of youth shelters: advocating increased government daily rates; seeking a balance between building a legitimate public image and an alternative street youth reputation; making every effort to house hard-core street youths; and building innovative internal programmes to act as referral points.