I have ordinal data that I collected by grading a statistics project based on an established rubric. The data is being used to measure students' increased conceptual understanding. Using the inappropriate t-tests to measure a difference in means from year to year, the data show statistically stignificant increases.
However, a nonparametric approach would be more appropriate (and more conservative.) Can someone point me in the direction of a non parametric test that could be conducted on ordinal data?
Thank you in advance!
Sharon J. Lane-Getaz
"Statistical thinking will one day be as necessary for efficient citizenship as the ability to read and write," HG Wells, 1904.
http://sharonlanegetaz.efoliomn2.com/
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