Average task times in usability tests: what to report?

Average task times in usability tests: what to report?
复制标题

可用性测试中的平均任务时间:报告什么?

DOI:
--
复制
发表时间:
2010
期刊:
International Conference on Human Factors in Computing Systems
影响因子:
--
通讯作者:
James R. Lewis
James R. Lewis
中科院分区:
--
文献类型:
--
作者:
Jeff Sauro;James R. Lewis

文献摘要

参考文献

被引文献

相似文献

可用性研究中任务时间数据的分布是正向倾斜的。意识到这一正向偏差的从业者倾向于报告样本中值。使用61个大样本可用性任务的数据进行的蒙特卡罗模拟表明,样本中位数是对总体中位数的有偏估计。使用几何平均数估计总体中心的平均误差将比样本中位数减少13%,偏差将减少22%。对人口中心的其他估计(修整、调和和Winsorized均值)的表现比样本中位数差。
The distribution of task time data in usability studies is positively skewed. Practitioners who are aware of this positive skew tend to report the sample median. Monte Carlo simulations using data from 61 large-sample usability tasks showed that the sample median is a biased estimate of the population median. Using the geometric mean to estimate the center of the population will, on average, have 13% less error and 22% less bias than the sample median. Other estimates of the population center (trimmed, harmonic and Winsorized means) had worse performance than the sample median.
DOI: 10.1037/0096-1523.14.3.539
发表时间: 1988-08-01
影响因子: 2.1
作者:
MILLER, J
通讯作者: MILLER, J