ERIC Number: ED175930
Record Type: Non-Journal
Publication Date: 1979-Apr
Reference Count: N/A
Effects of Off-Level Assignment on ITBS Grade Equivalent Scores.
Applebaum, Wayne R.
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 compare raw scores to ability (as defined by the model) on level 11, and to correlate grade equivalent scores of levels 9, 10, 12, 13 and 14 to level 11. The correlation was greater than .90. Severe discrepancies occurred, however, when a student's raw score was on the upper or lower end of the scale. It was concluded that when out-of-level testing is used and grade equivalent scores on different levels are considered on a single scale, test levels should be carefully assigned within the range of student ability. (CP)
Publication Type: Speeches/Meeting Papers; Reports - Research; Numerical/Quantitative Data
Education Level: N/A
Authoring Institution: N/A
Identifiers - Location: Texas (Dallas)
Identifiers - Assessments and Surveys: Iowa Tests of Basic Skills