Examined methodological issues related to the detection and evaluation of behavioral toxicity in infants and children, focusing on the selection of appropriate variables and strategies to control for confounding, sampling strategies and the problem of "overcontrol" for confounding; and the evaluation of dose-response relations and…

People with disabilities often are precluded from research by accessibility problems. This article explores what it really means to make research accessible, and provides suggestions for including people with 2 types of disabilities. Eight specific research activities are explored in relation to 2 disabilities (visual impairments and deafness).

Purpose: The purpose of this project was to develop a reliable and valid family satisfaction instrument for use in Ohio's nursing homes. Design and Methods: Investigators worked with an advisory council to develop the survey. Purposive sampling techniques were largely used to select 12 small, medium, and large for-profit and proprietary facilities…

To provide a better estimate of the prevalence of ADHD in adulthood, the authors complete a telephone survey of 966 randomly selected adults. They compute two diagnoses from the survey data. Participants meeting "Diagnostic and Statistical Manual of Mental Disorders" (4th ed.) criteria for both childhood and adulthood are defined as narrow ADHD.…

Over the past 3 decades we have witnessed an increase in the complexity of theoretical models that attempt to explain development in a number of behavioral domains. The conceptual movement to examine behavior from both developmental and contextual perspectives parallels recent methodological advances in the analysis of change. These new analysis…

The education of farmers would be result oriented if among other things the learning enhancement situations are created. Farmers' receptivity to training largely depends on the use of several educational methods by extension agents to reach farmers in Mezam division of Northwest province of Cameroon. Data were collected from May to August 2000…

The usual formula for variance depending on rounding off the sample mean lacks precision, especially when computer programs are used for the calculation. The well-known simplification of the total sums of squares does not always give benefit. Since the variance of two observations is easily calculated without the use of a sample mean, and the…

Many statistics educators believe that few students develop the level of conceptual understanding essential for them to apply correctly the statistical techniques at their disposal and to interpret their outcomes appropriately. It is also commonly believed that the sampling distribution plays an important role in developing this understanding.…

Today's college students are less prepared for college-level work than their predecessors. Once they get to college, they tend to spend fewer hours studying while spending more hours working, some even full time (D. T. Smart, C. A. Kelley, & J. S. Conant, 1999). In this study, the authors examined the effect of both time spent studying and time…

A number of studies in the United States have found that Jews obtain higher average IQs than white gentiles. This paper examines whether this is also the case in Britain. Three early studies are summarized that found that Jews in Britain have mean IQs in the range of 110-113. New data are presented for two nationally representative samples of 7-16…

The effect of time-related mean differences on estimates of association in cross-sectional studies has not been widely recognized in developmental and aging research. Cross-sectional studies of samples varying in age have found moderate to high levels of shared age-related variance among diverse age-related measures. These findings may be…

Research on markets and marketing of some non-timber forest products (NTFPs) was carried out in selected locations of Osun State. The NTFPs considered are chewing sticks such as "Massularia acuminata" and bush meat like "Thryonomys swinderianus", representing both the flora and fauna aspects of NTFPs, respectively. Five Local…

Significant numbers of students who are deaf and hard of hearing are educated in regular education settings, often outside the structure of established programs. Locating participants for research on deaf education has therefore become increasingly difficult. This article describes two approaches used to recruit participants in the recent online…

This article explores the existing and potential relationships between computer use and mathematical literacy. Specifically focusing on data obtained from the Program for International Student Assessment (PISA), the article describes some analyses of educational practices in U.S. schools in relation to various types of computer use and…

Conducting observational research in a cross-cultural context invokes a unique set of difficulties. This paper describes sources of bias and threats to validity that are specific to cross-cultural research. It describes problems of cross-cultural research designs for descriptive studies, comparative research, and experimental research and outlines…