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Permutation test for groups of scanpaths using normalized Levenshtein distances and application in NMR questions

Published: 28 March 2012 Publication History

Abstract

This paper presents a permutation test that statistically compares two groups of scanpaths. The test uses normalized Levenshtein distances when the lengths of scanpaths are not the same. This method was applied in a recent eye-tracking experiment in which two groups of chemistry students viewed nuclear magnetic resonance (NMR) spectroscopic signals and chose the corresponding molecular structure from the candidates. A significant difference was detected between the two groups, which is consistent with the fact that students in the expert group showed more efficient scan patterns in the experiment than the novice group. Various numbers of permutations were tested and the results showed that p-values only varied in a small range with different permutation numbers and that the statistical significance was not affected.

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    cover image ACM Conferences
    ETRA '12: Proceedings of the Symposium on Eye Tracking Research and Applications
    March 2012
    420 pages
    ISBN:9781450312219
    DOI:10.1145/2168556
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    Published: 28 March 2012

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    Author Tags

    1. NMR
    2. chemistry
    3. eye tracking
    4. permutation test
    5. scanpath

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    ETRA '12: Eye Tracking Research and Applications
    March 28 - 30, 2012
    California, Santa Barbara

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