Probe-level microarray data are usually stored in matrices. Take a given probe set (gene), for example, each row of the matrix corresponds to an array, and each column corresponds to a probe. Often, people summarize each array by the gene expression level. Is one number sufficient to summarize a whole probe set for a specific gene in an array?…

We argue that once we take into account the students' rational enrollment decisions, mismatch in the sense that the intended beneficiary of affirmative action admission policies are made worse off could occur only if selective universities possess private information about students' post-enrollment treatment effects. This necessary condition for…

Three multidimensional item response theory (IRT) models for testlet-based tests are described. In the bifactor model (Gibbons & Hedeker, 1992), each item measures a general dimension in addition to a testlet-specific dimension. The testlet model (Bradlow, Wainer, & Wang, 1999) is a bifactor model in which the loadings on the specific dimensions…

Both within and beyond the OECD region, governments and other stakeholders are increasingly interested in the assessments of the skills of their adult populations in order to monitor how well prepared they are for the challenges of the knowledge based society. The current paper provides an overview of the two international assessments of adult…

The Arizona English-Language Learner Assessment (AZELLA) is the backbone of Arizona's new English-language learner (ELL) policy in that it is used to assess students' English-language proficiency in order to place them into groups for English-language instruction and to determine when they have become proficient in English. This paper evaluates a…

Electropalatometry is a useful clinical and research tool for measuring linguapalatal contact. The goal of this study was to examine intra-speaker variability in performance. Twenty individuals spoke VCV nonsense words using a schwa in the initial position, the 15 palatal consonants, and three corner vowels, /alpha/, /i/, /u/. A variability index…

14 Secrets for a Happy Artist's Life is an online art exchange group founded by Gerity in 2006 as an egalitarian virtual community art studio. The online and mail art format provides a safe arena to create, view, and generously exchange artwork of all kinds. Ideas discovered within the virtual art studio have been applied to art therapy settings.…

Collaborative systems are widely used today in various activity fields. Their complexity is high and the development involves numerous resources and costs. Testing collaborative systems has a very important role for the systems' success. In this paper we present taxonomy of collaborative systems. The collaborative systems are classified in many…

The purpose of this study was to evaluate the influence of the location (ankle, hip, wrist) where an activity monitor (AM) is worn and of the minimum bout duration (BD) on physical activity (PA) variables during free-living monitoring. Study 1 participants wore AMs at three locations for 1 day while wearing the Intelligent Device for Energy…

In multilevel structural equation modeling, the "standard" approach to evaluating the goodness of model fit has a potential limitation in detecting the lack of fit at the higher level. Level-specific model fit evaluation can address this limitation and is more informative in locating the source of lack of model fit. We proposed level-specific test…

Among a number of lessons, this commentary suggests that oftentimes the grade a student receives in a class is not truly reflective of what that student learned. Certainly, assigning grades--at least for those who take their role as educators seriously--is one of the toughest tasks confronting the classroom teacher. Again and again, one reflects…

This article reports and demonstrates two SPSS macros for calculating Krippendorff's alpha and intraclass reliability coefficients in repetitive situations where numerous coefficients are needed. Specifically, the reported SPSS macros were used to evaluate the interrater agreement and reliability of student evaluations of teaching in thousands of…

A key aim of educational course design is to encourage students to adopt deeper approaches to learning. This article reports the findings of three studies that explored how medical students responded to three carefully designed educational course units. The findings suggest that, while a subgroup of the students responded by adopting deeper…

The authors respond to the commentaries on a series of articles (in the March 2009 issue of "Educational Researcher") that discuss the challenges associated with measuring reading instruction. The authors argue that the teaching of reading is a complex, multifaceted phenomenon best studied through a variety of overlapping and complementary…

We examined the effects of three different presession conditions on tangibly maintained problem behavior for 2 students with autism, using individual-participant multielement designs. First, an analogue functional analysis demonstrated that problem behavior was maintained by access to tangible items. Next, topographies of item rejection were…