A Test for Cluster Bias: Detecting Violations of Measurement Invariance Across Clusters in Multilevel Data

We present a test for cluster bias, which can be used to detect violations of measurement invariance across clusters in 2-level data. We show how measurement invariance assumptions across clusters imply measurement invariance across levels in a 2-level factor model. Cluster bias is investigated by testing whether the within-level factor loadings are equal to the between-level factor loadings, and whether the between-level residual variances are zero. The test is illustrated with an example from school research. In a simulation study, we show that the cluster bias test has sufficient power, and the proportions of false positives are close to the chosen levels of significance.     

Developing Relationships Between Sexual Health Clinics and Schools: More than clinic nurses doing sex education sessions?

Linking schools with sexual health clinics facilitates clinic access by young people. This paper documents the process of developing one such link and its impact on clinic use. Multiple data collection strategies were used to document a developing school/clinic relationship and constant comparative analysis was used to develop hypotheses from the data as follows: ” A few teachers have a good knowledge of local sexual health services and extensive experience of referring to them. ” Most tutors (despite their pastoral role) have little knowledge of local sexual health services and no experience of referring to them. ” Organising work in the school is difficult because teachers have little non-teaching time and a variable commitment to sex and relationship education. ” The link between the clinic and the school has facilitated access to the clinic by school pupils. ” Outreach work is more effective when young people meet the outreach worker repeatedly in different settings. Each hypothesis is presented with its supporting data. This information is consistent with what is known about the benefits of school/clinic links and adds to what is known about the process of developing and maintaining such links.     

Management of bullying in Northern Ireland schools: a pre-legislative survey

Background:?Unlike the rest of the UK, Northern Ireland has only recently (2003) implemented legislation regarding the requirement for anti-bullying policies in the province's school system.

Purpose:?The purpose of the study was to ascertain the nature of the management of bully/victim problems across Northern Ireland schools prior to the enactment of legislation.

Sample:?From an exhaustive sampling frame of all 1329 schools in Northern Ireland (96 nursery, 910 primary, 167 secondary, 73 grammar, 54 special, 29 further education), a total of 285 schools replied to a questionnaire (20 nursery, 181 primary, 41 secondary, 26 grammar, 13 special, 3 further education, 1 non-specified), a return rate of 23.11%.

Design and methods:?A review of the literature and consultation with educational experts in Northern Ireland resulted in the development of an ‘Audit’ questionnaire designed to examine dissemination and implementation (or not) of Department of Education, or bespoke, discipline and anti-bullying policies; components of anti-bullying programmes; the communication of anti-bullying policies to the school community; staff training; reporting and management of claims of staff victimisation; sanctions against bullies; and homophobic bullying.

Results:?It was found that, in a legislative vacuum, the schools in Northern Ireland had been acting in a proactive manner regarding the management of such bully/victim problems (e.g., development and implementation of policies, effective communication strategies).

Conclusions:?These results provide a baseline from which the efficacy of subsequent legislation in Northern Ireland can be evaluated. Utilisation of the methodology adopted in this study would be beneficial in other jurisdictions in evaluations of knowledge, attitudes and management of bully/victim problems, either pre- or post-implementation of legislation.     

The effect of rowing to exhaustion on frontal plane angular changes in the lumbar spine of elite rowers

Abstract

Lumbar spine injury is common in rowers and examination of spinal kinematics may improve the understanding of this injury's prevalence. This study aimed to examine the range of frontal plane angular displacement (AD) in the lumbar spine at L3 during ergometer rowing and to investigate the effect of exhaustion on lumbar kinematics. Twelve elite male rowers completed an incremental test on a Concept 2 ergometer. Lumbar AD at L3 was measured continually throughout the rowing trial using a Spectrotilt Inclinometer and blood lactate was sampled at 3-minute intervals. AD of between 4.7° and 8.8° was recorded at L3. There was a significant increase in AD between the first and last stage of the test (mean increase = 4.1 ± 1.94°, 95% Confidence Interval [CI], 2.9 to 5.3°, t = 7.36, P = 0.000014). Incremental rise in AD was associated with an incremental rise in blood lactate but regression confirmed that only stroke rate was a significant predictor for increasing angle. Thus there is a statistically significant increase in frontal plane AD at L3 over the course of an incremental exercise test although it cannot be confirmed if this is as a result of exhaustion. The values of AD confirm that there is motion in the frontal plane in ergometer rowing.     

Assessment of Course-Based Undergraduate Research Experiences: A Meeting Report

The Course-Based Undergraduate Research Experiences Network (CUREnet) was initiated in 2012 with funding from the National Science Foundation program for Research Coordination Networks in Undergraduate Biology Education. CUREnet aims to address topics, problems, and opportunities inherent to integrating research experiences into undergraduate courses. During CUREnet meetings and discussions, it became apparent that there is need for a clear definition of what constitutes a CURE and systematic exploration of what makes CUREs meaningful in terms of student learning. Thus, we assembled a small working group of people with expertise in CURE instruction and assessment to: 1) draft an operational definition of a CURE, with the aim of defining what makes a laboratory course or project a “research experience”; 2) summarize research on CUREs, as well as findings from studies of undergraduate research internships that would be useful for thinking about how students are influenced by participating in CUREs; and 3) identify areas of greatest need with respect to CURE assessment, and directions for future research on and evaluation of CUREs. This report summarizes the outcomes and recommendations of this meeting.

Students can work with the same data at the same time and with the same tools as research scientists.iPlant Education, Outreach & Training Group (2008, personal communication)

     

Nutritional, lifestyle, and weight control practices of professional jockeys

In this study, we describe diet and lifestyle practices of professional jockeys. Participants completed a 59-item nutrition, lifestyle, and health questionnaire (n = 21) and a 7-day estimated food diary (n = 18). Acute weight loss strategies included the use of saunas (86%), exercising to induce sweating (81%), and restricted energy intake (71%). Of the smokers (38%), 56% used smoking to control weight. Most (86%) jockeys reported attaining a 2-kg weight loss for racing (if required) 24-48 h before or on the designated race-day. Mean daily energy intake (1803 ± 564 kcal) was low and appeared to provide an insufficient availability of energy for sustainment of usual daily and metabolic processes. Carbohydrate intake (3.7 ± 1.3 g · kg?1) was below recommendations for athletes. A substantial proportion of jockeys failed to meet the estimated average requirement and lower threshold intake for a number of micronutrients. Jockeys consumed well below (0-2) the recommended five daily servings of fruit and vegetables set by the World Health Organization. Pressures of the jockey lifestyle and rigid weight limits appear to encourage unhealthy weight management practices in this group and may risk long term-health.     

Raven's test performance of sub-Saharan Africans: Average performance,psychometric properties,and the Flynn Effect

This paper presents a systematic review of published data on the performance of sub-Saharan Africans on Raven's Progressive Matrices. The specific goals were to estimate the average level of performance, to study the Flynn Effect in African samples, and to examine the psychometric meaning of Raven's test scores as measures of general intelligence. Convergent validity of the Raven's tests is found to be relatively poor, although reliability and predictive validity are comparable to western samples. Factor analyses indicate that the Raven's tests are relatively weak indicators of general intelligence among Africans, and often measure additional factors, besides general intelligence. The degree to which Raven's scores of Africans reflect levels of general intelligence is unknown. Average IQ of Africans is approximately 80 when compared to US norms. Raven's scores among African adults have shown secular increases over the years. It is concluded that the Flynn Effect has yet to take hold in sub-Saharan Africa.