How many students repeat a grade each year? How do retention rates vary across states and over time? Despite extensive research on the predictors and consequences of grade retention, there is no systematic way to quantify state-level retention rates; even national estimates rely on imperfect proxy measures. We present a conceptually simple…

Discusses criticisms of null hypothesis significance testing (NHST), suggesting that historical use of NHST was reasonable, and current users should read Sir Ronald Fisher's applied work. Notes that modifications to NHST and interpretations of its outcomes might better suit the needs of modern science. Concludes that NHST is most often useful as…

Education lags behind other scientific disciplines in its effective use of data displays. An example is provided in which the reorganization of data from two bar graphs into one table highlights the obvious and subtle results. To address the need for effective data display, the companion article, "Understanding Graphs and Tables," was…

Three historic examples demonstrate the vital role data displays (graphs and tables) have played in important discoveries. Levels of information that form the basis of a theory of display are described, and steps to improve the quality of tabular presentations in educational writing are outlined. (SLD)

Describes new directions and initiatives instituted at the National Center for Educational Statistics (NCES) since 1986 to fill data gaps, raise technical standards, and expand staff resources. Discusses implications for educational research and policy. (FMW)