Analyzing and Interpreting Data From Likert-Type Scales
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TLDR
Reading this article is to provide readers who do not have extensive statistics background with the basics needed to understand the basics of Likert scale concepts.Abstract:
Likert-type scales are frequently used in medical education and medical education research. Common uses include end-of-rotation trainee feedback, faculty evaluations of trainees, and assessment of performance after an educational intervention. A sizable percentage of the educational research manuscripts submitted to the Journal of Graduate Medical Education employ a Likert scale for part or all of the outcome assessments. Thus, understanding the interpretation and analysis of data derived from Likert scales is imperative for those working in medical education and education research. The goal of this article is to provide readers who do not have extensive statistics background with the basics needed to understand these concepts.
Developed in 1932 by Rensis Likert1 to measure attitudes, the typical Likert scale is a 5- or 7-point ordinal scale used by respondents to rate the degree to which they agree or disagree with a statement (table). In an ordinal scale, responses can be rated or ranked, but the distance between responses is not measurable. Thus, the differences between “always,” “often,” and “sometimes” on a frequency response Likert scale are not necessarily equal. In other words, one cannot assume that the difference between responses is equidistant even though the numbers assigned to those responses are. This is in contrast to interval data, in which the difference between responses can be calculated and the numbers do refer to a measureable “something.” An example of interval data would be numbers of procedures done per resident: a score of 3 means the resident has conducted 3 procedures. Interestingly, with computer technology, survey designers can create continuous measure scales that do provide interval responses as an alternative to a Likert scale. The various continuous measures for pain are well-known examples of this (figure 1).
FIGURE 1
Continuous Measure Example
TABLE
Typical Likert Scalesread more
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References
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A technique for the measurement of attitudes
TL;DR: The instrument to be described here is not, however, indirect in the usual sense of the word; it does not seek responses to items apparently unrelated to the attitudes investigated, and seeks to measure prejudice in a manner less direct than is true of the usual prejudice scale.
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Journal ArticleDOI
Likert scales: how to (ab)use them
TL;DR: I have recently used Likert-type rating scales to measure student views on various educational interventions, providing a range of responses to a given question or statement.
Journal ArticleDOI
Resolving the 50-year debate around using and misusing Likert scales.
James Carifio,Rocco J. Perla +1 more
TL;DR: Most recently in this journal, Jamieson outlined the view that ‘Likert scales’ are ordinal in character and that they must be analysed using non-parametric statistics, which are less sensitive and less powerful than parametric statistics and are more likely to miss weaker or emerging findings.
Journal ArticleDOI
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