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ERIC Number: ED227128
Record Type: RIE
Publication Date: 1982-Oct
Pages: 33
Abstractor: N/A
Reference Count: 0
ISBN: N/A
ISSN: N/A
Use of Aggregation to Improve the Reliability of Simple Direct Measures of Academic Performance.
Fuchs, Lynn S.; And Others
The effects of aggregation on the reliability of measures of academic performance were explored in two studies. In the first study, 30 elementary-age children were tested four times on the same forms of the Woodcock Reading Mastery Tests and the Ginn 720 Reading Passage measures. Group stability coefficients, within-subject reliability coefficients, and group correlations between variables each were calculated on the basis of one or two testings and then on the basis of aggregations over four testings. On the standardized measure and on the oral passage reading correct rate score, aggregation had little impact; however, on the oral passage reading error rate score, aggregation substantially increased all reliability indices. In the second study, 78 children were tested 10 times on alternate forms of two reading measures and one written expression measure. Group stability coefficients were calculated on the basis of 2, 4, 6, 8, and 10 testings. For the oral words-in-isolation reading correct score, aggregation had little effect, whereas aggregating over occasions and test forms dramatically improved the stability of the oral words-in-isolation reading error score and the written expression score. The reliability and criterion validity of short, simple measures demonstrated their suitability as measures of academic performance. (Author/PN)
Editor, IRLD, 350 Elliott Hall, 750 East River Road, University of Minneapolis, MN 55455 ($3.00)
Publication Type: Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: Special Education Programs (ED/OSERS), Washington, DC.
Authoring Institution: Minnesota Univ., Minneapolis. Inst. for Research on Learning Disabilities.
Identifiers: Aggregation (Data); Ginn Reading 720 Series; Woodcock Reading Mastery Test