Cover Journal of the American Veterinary Medical Association
Journal of the American Veterinary Medical Association
ISSN:
0003-1488
Publication Date:
15 Apr 2019

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DOI:
https://doi.org/10.2460/javma.254.8.917
Volume/Issue:
Volume 254: Issue 8
Online Publication Date:
15 Apr 2019
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Questions on statistical methods

Regarding the report by Rovel et al1 titled “Evaluation of standing low-field magnetic resonance imaging for diagnosis of advanced distal interphalangeal primary degenerative joint disease in horses: 12 cases (2010–2014),” I was disappointed to see what I believe to be clear critical flaws in the statistical methods. First, t tests were performed on data that were not collected from a random sample. Second, ordinal grade data were treated as continuous measurements.

Specifically, t tests should be reserved for data collected from random samples, whereas this study was a case series,