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Modeling and Predicting Pointing Errors in Two Dimensions

机译:建模和预测两个维度指向误差

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Recently, Wobbrock et al. (2008) derived a predictive model of pointing accuracy to complement Fitts' law's predictive model of pointing speed. However, their model was based on one-dimensional (1-D) horizontal movement, while applications of such a model require two dimensions (2-D). In this paper, the pointing error model is investigated for 2-D pointing in a study of 21 participants performing a time-matching task on the ISO 9241-9 ring-of-circles layout. Results show that the pointing error model holds well in 2-D. If univariate endpoint deviation (SD_x) is used, regressing on N=72 observed vs. predicted error rate points yields R~2=.953. If bivariate endpoint deviation (SD_(x,y)) is used, regression yields R~2=.936. For both univariate and bivariate models, the magnitudes of observed and predicted error rates are comparable.
机译:最近,Wobbrock等。 (2008)衍生出一种指向精度的预测模型,以补充FITTS定律的指示速度的预测模型。然而,它们的模型基于一维(1-D)水平运动,而这种模型的应用需要两个维度(2-D)。在本文中,研究了指向误差模型的21名参与者在ISO 9241-9圈子布局上执行时间匹配任务的研究。结果表明,指向误差模型在2-D中保持良好。如果使用单变量端点偏差(SD_X),则在n = 72上的回归对Vs.预测误差率点产生R〜2 = .953。如果使用双变量端点偏差(SD_(x,y)),则回归产生R〜2 = .936。对于单变量和双变量模型,观察和预测的误差率的大小是可比的。

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