Evaluating Random and Systematic Error in Student Growth Percentiles

IF 1.1 4区 教育学 Q3 EDUCATION & EDUCATIONAL RESEARCH Applied Measurement in Education Pub Date : 2020-07-15 DOI:10.1080/08957347.2020.1789139
C. Wells, S. Sireci
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引用次数: 2

Abstract

ABSTRACT Student growth percentiles (SGPs) are currently used by several states and school districts to provide information about individual students as well as to evaluate teachers, schools, and school districts. For SGPs to be defensible for these purposes, they should be reliable. In this study, we examine the amount of systematic and random error in SGPs by simulating test scores for four grades and estimating SGPs using one, two, or three conditioning years. The results indicated that, although the amount of systematic error was small to moderate, the amount of random error was substantial, regardless of the number of conditioning years. For example, the standard error of the SGP estimates associated with an SGP value of 56 was 22.2 resulting in a 68% confidence interval that would range from 33.8 to 78.2 when using three conditioning years. The results are consistent with previous research and suggest SGP estimates are too imprecise to be reported for the purpose of understanding students’ progress over time.
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评价学生成长百分位数的随机和系统误差
摘要学生增长百分位数(SGP)目前被几个州和学区用于提供学生个人信息以及评估教师、学校和学区。为了使SGP能够用于这些目的,它们应该是可靠的。在这项研究中,我们通过模拟四个年级的考试成绩,并使用一年、两年或三年的条件年来估计SGP,来检验SGP中的系统性和随机性误差。结果表明,尽管系统误差的大小是小到中等的,但无论调节年限如何,随机误差的大小都是巨大的。例如,与SGP值为56相关的SGP估计的标准误差为22.2,导致在使用三个条件年时,68%的置信区间在33.8至78.2之间。研究结果与之前的研究一致,表明SGP估计值过于不精确,无法用于了解学生随时间的进步。
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来源期刊
CiteScore
2.50
自引率
13.30%
发文量
14
期刊介绍: Because interaction between the domains of research and application is critical to the evaluation and improvement of new educational measurement practices, Applied Measurement in Education" prime objective is to improve communication between academicians and practitioners. To help bridge the gap between theory and practice, articles in this journal describe original research studies, innovative strategies for solving educational measurement problems, and integrative reviews of current approaches to contemporary measurement issues. Peer Review Policy: All review papers in this journal have undergone editorial screening and peer review.
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