Academic journal article American Journal of Pharmaceutical Education

Educational Testing and Validity of Conclusions in the Scholarship of Teaching and Learning

Academic journal article American Journal of Pharmaceutical Education

Educational Testing and Validity of Conclusions in the Scholarship of Teaching and Learning

Article excerpt

INTRODUCTION

The rigor of education research, including research In medical education, has been under scrutiny for years. (1,2) On the technical side, issues raised include lack of examination of the psychometric properties of assessment instruments and/or insufficient reporting of validity and reliability. (3-5) On the applied side, researchers have frequently based their conclusions on significance without addressing the practical implications of their findings. (6) These issues appear even more pronounced in the pharmacy education literature. In a review of over 300 articles published in pharmacy and medical education journals using educational tests, Hoover and colleagues found that pharmacy education articles much more often lacked evidence of reliability (and consequently validity) than did medical education articles, while neither consistently reported validity evidence. (7) While not specifically evaluated in that study, few pharmacy education articles reported an effect size of their studied intervention (MJ Hoover, e-mail, April 17, 2013).

It is encouraging that diverse pharmacy education instructors have authored many of the reviewed articles, representing a scholarship of teaching and learning (SoTL). However, authors still need to actively pursue psychometric evaluation of their student-learning assessments and examine the practical significance of the results. Increasing the technical rigor of research and reporting effect sizes will increase the overall quality and meaningfulness of SoTL. While doing so can be challenging, it can be accomplished without formal training. Just as scientists would not conduct experiments without verifying that their instruments were properly calibrated and would not claim that an experiment worked without indicating the magnitude of the effect, a SoTL investigator should not presume an assessment instrument's reliability and validity but rather should seek evidence of both prior to attempting statistical analyses and interpret the results of those analyses from the perspective of educational significance (ie, effect size). This should be standard practice not only for standardized tests but also for other types of assessments of student knowledge and abilities, including performance-based assessments (eg, objective structured clinical examinations [OSCEs]) and traditional classroom assessments (eg, assessments with true/false, multiple-choice questions, case clinical notes, short-answer questions, and essay questions) used in SoTL.

This paper can be seen as an extension of a measurement series in Medical Education (8) for a SoTL audience, wherein it explicitly discusses the interrelatedness of psychometrics, statistics, and validity of conclusions. It is intended as a less-technical review of several established practices related to reporting educational test psychometrics and effect sizes, while also explaining how addressing both will contribute important evidence to the overall validity of data-based conclusions. Some of these practices involve statistical computations while others are based on logic. Following these practices should help SoTL investigators, who may not have formal training in psychometrics or statistics, to increase the rigor of their scholarship. We also offer a brief overview of some major advanced psychometric models that can be used to obtain further validity evidence. It is beyond the scope and focus of this paper to show how to create and administer assessments or how to calculate most statistics. We hope that the level of language, ideas, and examples herein will be relevant to the diverse readership. Examples from published studies, mainly in pharmacy education, are provided to illustrate some of the ways in which SoTL researchers could report findings.

VALIDITY

By its traditional definition, validity refers to the degree to which a test accurately and meaningfully measures what it is supposed to measure. …

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