Robustness estimators of location:a classification of linear and adaptive estimators

Real-world data sets may be described in terms similar to trauma cases- 'messy' with 'high morbidity'. Alternative estimators to the traditional mean are examined via a simulation study over a wide range of both symmetric and asymmetric distributions. These alternative estimators are data depenmdent and, in most cases, represent data far better than the usual mean. Princeton and post-Princeton linear and adaptive estimators of location are summarized, and a classification scheme based on an ancillary or selector statistic is proposed. The computational formulae for the collection of estimators have been standardized, as have the ancillary statistics. We classify these estimators by their computational form, give the computational formulae for each in a standardized notation, evaluate the subclass of estimators, and identify our 'winner' in that class.     

Robust Two-Sample Statistics for Testing Equality of Means: a Simulation Study

When testing the equality of the means from two independent normally distributed populations given that the variances of the two populations are unknown but assumed equal, the classical two-sample t-test is recommended. If the underlying population distributions are normal with unequal and unknown variances, either Welch's t-statistic or Satterthwaite's Approximate F-test is suggested. However, Welch's procedure is non-robust under most non-normal distributions. There is a variable tolerance level around the strict assumptions of data independence, homogeneity of variances and normality of the distributions. Few textbooks offer alternatives when one or more of the underlying assumptions are not defensible.     

Relationships between physical activity and the proximity of exercise facilities and home exercise equipment used by undergraduate university students

The authors used stratified random sampling procedures to investigate the relationships among physical activity (PA), the proximity of exercise facilities, and the quantity of home exercise equipment in a sample of 411 undergraduates. To examine the data they collected from the modified Godin Leisure-Time Exercise Questionnaire and the Home Environment Questionnaire, the authors used correlational analyses and analysis of variance. Intensity and duration of PA showed a significant relationship to the proximity of exercise facilities. Intensity, frequency, and duration of PA were significantly related to the quantity of students' home exercise equipment. Freshmen and sophomores engaged in PA closer to their residences and participated in 3 more exercise bouts per week than juniors and seniors. These findings suggest that proximity of the activity episode may have an effect on PA behavior of college students.     

The impact of marriage on fertility intentions and related values

Entry into and occupancy of major adult roles are of longstanding theoretical interest, but few studies have designs adequate to examine the consequences of associated changes in orientation. This study is based on a longitudinal project in which changes in fertility intentions and the importance of marriage and the family are examined among four subgroups--females who remained single, females who married, males who remained single, and males who married over a five-year period. Females, regardless of marital status, became less inclined to have children, males remaining single became more inclined and males who married over the interval changed little. When a control for value of marriage and the family was introduced, gender-based differences in fertility desires disappeared. There were substantial changes in the value domain according to sex and marital status--those who married over the five-year period displayed significant increases in the importance of the value of marriage and family. The implications of these findings are discussed.     

Girls being Rey: ethical cultural consumption,families and popular feminism

ABSTRACT

This paper argues that consumers of popular culture engage in practices of ‘ethical cultural consumption’, whereby the consumption of cultural texts is imagined as having the potential to ‘do good’ both individually and socio-politically. The paper explores data from an online questionnaire and drawing activity with girls aged 5–10 and their parents on the experience of costume playing as Rey from the contemporary Star Wars trilogy. Imagined as a ‘girl who can do anything’, Rey represents a new kind of popular feminist hero and role model for girls, enabling a degree of critique of normative gendered role models for children. ‘Being Rey’ also represents a deterministic project through which parents aim to cultivate the ‘right’ kind of girls, seeking to instil the resilience to ‘cope’ with unknown futures. More than a purely individual project, we argue that parents invest in an individualized idea of doing ‘good’ through consumption, drawing on a notion of the consumer as a political actor with the power to affect social change. Investigating the project of participating in and consuming culture ‘ethically’ allows for an exploration of what it means to ‘be political’ and ‘do good’ as a consumer in neoliberalism.     

An Outcome Study of Career Decision Self‐Efficacy and Indecision in an Undergraduate Constructivist Career Course

This study explored outcomes in a constructivist career course. Using a pretest‐ posttest design, the authors assessed the empowerment (operationalized as career decision self‐efficacy) and career indecision of 82 culturally diverse college students at a large, midwestern university. Data were analyzed using a multivariate analysis of variance. Results indicated that students reported significant increases in empowerment with no commensurate decreases in career indecision. In addition to shedding light on the nuanced relationship between empowerment or career decision self‐efficacy and indecision, results indicate the potential constructivist career development has to empower culturally diverse college students.