Academic Lineage and Student Performance in Medical School Page: 32
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difference between the mean ranks) were tested using the Kruskal-Wallis Test, often
called the "analysis of variance by ranks," at the .05 alpha level (Zar, p. 199). If the null
hypothesis for any individual outcome measure was rejected, post-hoc multiple
comparison tests (the Dunn method for nonparametric statistics; see Zar, p.227) were
performed also at the .05 alpha level to identify which classification(s)/group(s) differed.
For comparison of the public or private governing control groups, observed scores
for cumulative medical school grade point average, medical school class rank, and
performance on the USMLE, Step 1, were ranked and a mean rank computed for each
group. The null hypotheses (no difference between mean ranks) were tested by using the
Mann-Whitney U test at the .05 alpha level (Hinkle, Wiersam, Juns, 1994, p. 562).
For the dependent variable of failure/dismissal rate, the proportion of all students
who failed a course/year or were dismissed from school was calculated for each level of
each independent variable. The Tukey-type multiple comparison test among proportions
(Zar, p. 560) was used at the .05 alpha level to determine whether a significant difference
existed between groups.
Data pertaining to the independent variables in the study (Carnegie classification
of institutions of origin, admission selectivity, and institutional control) were analyzed
using the Mueller-Schuessler Index of Qualitative Variation (Champion, 1970, p.46).
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Wright, James Scott. Academic Lineage and Student Performance in Medical School, dissertation, August 1999; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc2206/m1/41/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .