Issues Related to Using Finger-Fitts law to Model One-Dimensional Touch Pointing Tasks

Yu-Jung Ko, Hang Zhao, I. Ramakrishnan, Shumin Zhai, Xiaojun Bi
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Abstract

Finger-Fitts law [6] is a variant of Fitts’ law which accounts for the finger ambiguity in touch pointing. In this paper we investigated two research questions related to Finger-Fitts law: (1) Should Finger-Fitts law use nominal target width W or effect target width We to model MT? and (2) should Finger-Fitts law use a pre-defined value (denoted by σa) or a free parameter (denoted by c) to represent the absolute ambiguity caused by finger touch? Our investigation on two touch pointing datasets showed that there are cases where using nominal width has stronger model fitness, and also cases where using effective width is better. Regarding the representation of finger ambiguity, using a free parameter c to represent the ambiguity of finger touch always leads to stronger model fitness than using the pre-defined σa, after controlling for overfitting. It indicates that viewing the finger ambiguity as an empirically determined parameter has more flexibility to capture the ambiguity of finger touch involved in the study. Overall, our research advances the understanding on how to model Finger touch input with Finger-Fitts law.
使用手指匹配法来模拟一维触摸指向任务的相关问题
手指-菲茨定律[6]是菲茨定律的一个变体,它解释了手指在触摸指向中的模糊性。在本文中,我们研究了与Finger-Fitts定律相关的两个研究问题:(1)Finger-Fitts定律应该使用标称目标宽度W还是效果目标宽度we来建模MT?(2) finger - fitts定律应该用一个预定义的值(σa)还是一个自由参数(c)来表示由手指触摸引起的绝对模糊?我们对两个触摸指向数据集的调查表明,在某些情况下,使用标称宽度具有更强的模型适应度,而在某些情况下,使用有效宽度更好。对于手指模糊度的表示,在控制过拟合后,使用自由参数c来表示手指触摸的模糊度总是比使用预定义的σa更强。这表明,将手指歧义作为一个经验确定的参数,可以更灵活地捕捉研究中涉及的手指触摸歧义。总的来说,我们的研究促进了对如何用Finger- fits法则建模手指触摸输入的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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