SH-Model: A Model Based on Both System and Human Effects for Pointing Task Evaluation

Abstract

As a well-known human performance model, Fitts' law, a tool for evaluating pointing devices, has been accepted and applied for a long time in the human computer interaction field. However, doubts now exist regarding its validity. One challenging job for those who are doing research on human performance models is to resolve the problem relating to input hits' distribution (i.e., spatial constraint). We developed a new model based on temporal distribution to alter the traditional models. The new model and the traditional models are compared in two experiments using AIC (Akaike's Information Criterion), a criterion for statistical model selection. The results show that the new model is better than the traditional ones in performance evaluation.

An investigation of subjective operational biases in steering tasks evaluation

“…the normal distribution of end-points, which lacks theoretical and empirical foundations. Based on temporal constraint (distribution of movement time data), a new model, called SH-Model (Ren et al 2005), was presented to include system and human effects in Fitts' target acquisition tasks. Empirical analysis showed that the SH-Model is stronger than the Shannon model 2 (MacKenzie 1989) and W e model.…”

Bayesian Modeling for Identification and Estimation of the Learning Effects of Pointing Tasks

“…In this paper, we extend the works in [13,14,16] by proposing some new models based on the BoxCox transformation. Then, we introduce a Bayesian modeling method to identify and estimate the learning effects of pointing tasks in human-computer interaction.…”

“…The size of the display was 480pixels × 160pixels with 1 pixel being about 0.24 mm. Experimental software was developed with Java (see [13] for details). Twelve subjects (6 males, 6 females, aged between 20 to 22) were tested in the experiment which was of 3 × 3 within-subjects factorial design.…”

“…These problems in Fitts' law prompted the studies of [13] and [9] where the SH-model was introduced and was applied to performance evaluation and comparison of pointing tasks. The SH-model is a linear model for the logarithm of the movement time with the systematic factor and the human factor being the two explanatory variables.…”

How does the subjective operational biases hit the steering law?

“…end-points' normal distribution, which lacks of theoretical and empirical foundations. Based on temporal constraint (distribution of movement time data), a new model, called SH-Model [5], was presented to involve system and human effects in Fitts' target acquisition tasks. Empirical analysis showed that SH-Model is stronger than Shannon model 2 and W e model.…”