During the past 25 years, the country witnessed a dramatic transformation of the National Assessment of Educational Progress (NAEP). Actions by the Educational Testing Service (ETS), Congress, and the National Assessment Governing Board fundamentally changed NAEP's role in federal educational policy and the nation's schools. Developed in the 1960s…

The Rasch model was used to compare the grade equivalent scores which students of equal ability would have obtained, had they taken different levels of the Iowa Tests of Basic Skills (ITBS). Raw scores on items common to levels 9-14 of the ITBS (vocabulary subtest) were obtained from 6,000 students in Dallas, Texas. Rasch scales were used to…

The accuracy with which regression models estimate treatment effects is dependent upon a number of conditions. The stability of the regression line (a function of sample size and correlation between pretest and posttest) is said to be the most important of these conditions. The utility of regression models is proportional to the size of the…

In fall 1997, the Washington Scholarship Fund expanded its privately funded school voucher program in Washington, D.C., and in 1998, over 1,000 students were offered scholarships by lottery. This evaluation examined the impact of the first 2 years of the program on students who completed baseline testing and were in grades 1-7 in spring 1998. It…