clinical research usually involves patients with a certain disease or a condition. the generalizability of clinical research findings is based on multiple factors related to the internal and external validity of the research methods. the main methodological issue that influences the generalizability of clinical research findings is the sampling method. in this educational article, we are explai...

The concept of generalizability is not homogeneous and monolithic, but can be analyzed into four types: the generalizability of a theory to different settings, the generalizability of a theory within a setting, the generalizability of a measurement or observation, and the generalizability of a variable, construct, or other concept. In this study, we affirm the legitimacy of the statistical, sam...

The score reliability of language performance tests has attracted increasing interest. Classical Test Theory cannot examine multiple sources of measurement error. Generalizability theory extends Classical Test Theory to provide a practical framework to identify and estimate multiple factors contributing to the total variance of measurement. Generalizability theory by using analysis of variance ...

In this paper, we define the generalization problem, summarize various approaches in generalization, identify the credit assignment problem, and present the problem and some solutions in measuring generalizability. We discuss anomalies in the ordering of hypotheses in a subdomain when performance is normalized and averaged, and show conditions under which anomalies can be eliminated. To general...

Generalizability (G) theory is a statistical theory for evaluating the dependability (or reliability) of behavioral measurements (Cronbach, Gleser, Nanda, & Rajaratnam, 1972; see also Brennan, 2001; Shavelson & Webb, 1991). G theory permits the researcher to address such questions as: Is the sampling of tasks or judges the major source of measurement error? Can I improve the reliability of the ...

How the probands are recruited also can affect the quality of a study’s conclusions. One potential source of bias is the influence of environmental factors on the selection of proband adoptees in the adoptees’ family method. For example, psychological or social problems in an adoptive family may contribute to the adoptee’s psychopathology. Simultaneously, these problems may prompt the family an...