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ERIC Number: EJ1160664
Record Type: Journal
Publication Date: 2017-Oct
Pages: 11
Abstractor: As Provided
ISBN: N/A
ISSN: EISSN-1531-7714
EISSN: N/A
Data Transformations for Inference with Linear Regression: Clarifications and Recommendations
Pek, Jolynn; Wong, Octavia; Wong, C. M.
Practical Assessment, Research & Evaluation, v22 n9 Oct 2017
Data transformations have been promoted as a popular and easy-to-implement remedy to address the assumption of normally distributed errors (in the population) in linear regression. However, the application of data transformations introduces non-ignorable complexities which should be fully appreciated before their implementation. This paper adds to existing "Practical Research and Assessment Evaluation" ("PARE") publications on data transformations by providing a broad overview underlying the use of data transformations for the specific purpose of statistical inference and interpreting meaningful effect sizes. Data transformations not only potentially change the scale of the transformed variable; they also alter the fundamental relationships among variables while simultaneously changing the distribution of the errors. Given these repercussions, we clarify the nature of certain data transformations and strongly recommend the use of data transformations when they can enhance the interpretation of effect sizes.
Center for Educational Assessment. 813 North Pleasant Street, Amherst, MA 01002. e-mail: pare@umass.edu; Tel: 413-577-2180; Web site: https://scholarworks.umass.edu/pare
Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A