Unlimiting the Dual Gaussian Distribution Model to Predict Touch Accuracy in On-screen-start Pointing TasksDownload PDF


04 Apr 2020 (modified: 04 Apr 2020)Graphics Interface 2020 Conference Blind SubmissionReaders: Everyone
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  • Keywords: Dual Gaussian distribution model, touchscreens, finger input, pointing, graphical user interfaces
  • Abstract: The dual Gaussian distribution hypothesis has been utilized to predict the success rate of target acquisition in finger touching. Bi and Zhai limited the applicability of their success-rate prediction model to off-screen-start pointing. However, we found that their doing so was theoretically over-limiting and their prediction model could also be used to on-screen-start pointing operations. We discuss the reasons why and empirically validate our hypothesis in a series of four experiments with various target sizes and distances. Bi and Zhai's model showed high prediction accuracy in all the experiments, with 10% prediction error at worst. Our theoretical and empirical justifications will enable designers and researchers to use a single model to predict success rates regardless of whether users mainly perform on- or off-screen-start pointing and automatically generate and optimize UI items on apps and keyboards.
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