Several currently popular methods of ascertaining which treatment (population) means are different, via random samples obtained under each treatment, are briefly described and illustrated by evaluating catalyst performance in a chemical reactor.

In this paper we discuss several key challenges encountered when conducting a study of the continuity of participation in the child care subsidy program. While many of these issues are familiar to those who have studied participation dynamics in other assistance programs, and to those familiar with survival analysis, we describe these challenges…

The study aims to explore the nature of selected domains of self-concept (namely behaviour, Intellectual and school status, physical appearance and attributes, anxiety, happiness and satisfaction) of the sighted adolescents and the adolescents with a visual impairment. The sample (N = 160) have been drawn by simple random sampling from 100 sighted…

This study focused on educational research papers published from 2005-2009 in journals listed in SSCI and the ULAKBIM database in Turkey. Study types, research methods, investigated specific topics, used data collection tools, employed data analysis methods, and utilized types of samples and sampling methods were analyzed. A total of 2115 papers…

Small sample equating remains a largely unexplored area of research. This study attempts to fill in some of the research gaps via a large-scale, IRT-based simulation study that evaluates the performance of seven small-sample equating methods under various test characteristic and sampling conditions. The equating methods considered are typically…

This three-volume report describes the "SAM (School Administration Manager) process," an approach that about 700 schools around the nation are using to direct more of principals' time and effort to improve teaching and learning in classrooms. Research has shown that a principal's instructional leadership is second only to teaching among…

In 1988, the National Center for Education Statistics (NCES) developed a private school data collection that improved on the sporadic collection of private school data dating back to 1890 by developing an alternative to commercially available private school sampling frames. Since 1989, the U.S. Bureau of the Census has conducted the biennial…

Research pertaining to the distortion of the squared canonical correlation coefficient has traditionally been limited to the effects of sampling error and associated correction formulas. The purpose of this study was to compare the degree of attenuation of the squared canonical correlation coefficient under varying conditions of score reliability.…

Nosofsky (1983) reported that additional stimulus presentations within a trial increase discriminability in absolute identification, suggesting that each presentation creates an independent stimulus representation, but it remains unclear whether exposure duration or the formation of independent representations improves discrimination in such…

The purpose of the study was to investigate the general working structure of non-governmental organizations (NGOs) and to examine the services and facilities provided by NGOs for basic education in Punjab, Pakistan. The population comprised 112 NGOs working for the promotion of basic education in Punjab, 3980 teachers working in basic education…

This article uses meta-analyses published in "Psychological Bulletin" from 1995 to 2005 to describe meta-analyses in psychology, including examination of statistical power, Type I errors resulting from multiple comparisons, and model choice. Retrospective power estimates indicated that univariate categorical and continuous moderators, individual…

Progress in International Reading Literacy Study (PIRLS) provides international comparative data about students' reading achievement after four years of primary schooling, while also measuring trends over time, monitoring curricular implementation, and identifying promising instructional practices. Conducted on a regular 5-year cycle, PIRLS has…

The reform policies of standards-based accountability, as outlined in NCLB, impede the functioning of school counseling programs and the delivery of services to students. Although recent studies have focused on the transformation of the school counseling profession, a gap exists in the literature with regard to how the experiences of school…

Studies often report that bilingual participants possess a smaller vocabulary in the language of testing than monolinguals, especially in research with children. However, each study is based on a small sample so it is difficult to determine whether the vocabulary difference is due to sampling error. We report the results of an analysis of 1,738…

This article examines the issue of cognates in frequency-based vocabulary size testing. Data from a pilot study for a cognate-controlled English vocabulary size test was used to assess whether a group of Japanese university English learners (n = 60) were more successful at responding to cognate items than noncognate ones in three 1000 word…