Question

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Repeatability. This research evaluated the repeatability of SSG and CIST measurements.
Repeatability is a measure of the variability between independent test results obtained on the
same experimental material and may generally be evaluated by considering the standard
deviation or COV of repeated measurements (15). As shown in Figure 3, the relationships
between the averages and standard deviations for both the SSG and CIST exhibit a degree of
heteroskedasticity, the statistical term given to describe an increasing variation, or scatter, of the
response variable (standard deviation) with increasing values of the independent variable
(average reading) (16). Thus, if standard deviation alone is used to measure the repeatability of
the data, the repeatability must be given as a function of the average value.
Therefore, to compensate for the effects of heteroskedasticity, the COV was used to
compare the repeatability of the devices. The average COVs at sites 1, 2, and 3 were 8.00, 4.48,
and 3.52, respectively, for the SSG and 9.86, 8.03, and 6.91, respectively, for the CIST. Paired t-
tests were performed to investigate the significance of these differences between the SSG and the
CIST, where the null hypothesis in each test was that the mean COVs were equal and the
alternative hypothesis was that they were not equal. The testing yielded p -values of 0.280,
0.145, and 0.002 for sites 1, 2, and 3, respectively. At the standard error rate of 0.05, this
indicates that the differences in COV between the SSG and CIST at sites 1 and 2 are not
significantly different; however, the COV of the SSG is less than that of the CIST at site 3.
Because lower COVs are associated with better repeatability, these analyses suggest that the

TRB 2005 Annual Meeting CD-ROM Paper revised from original submittal.

Answer 1

可重复性。这项研究评估了重复性的特殊保障和中科院测量。
可重复性是衡量该变异之间的独立测试所取得的成果对
同样的实验材料，并可能总体评价考虑标准
偏离或冠状病毒的反复测量（ 15 ） 。如图3所示，关系
之间的平均数和标准差都特别保障和中科院展品在一定程度上
异方差，统计来说，由于来形容，越来越变异，或散步，对
响应变量（标准差） ，与增加值的独立变数
（平均读） （ 16 ） 。因此，如果标准差仅是用来测量重复性
这些数据，可重复性必须考虑作为一个函数的平均值。
因此，为弥补的影响，异方差，该病毒被用来
比较重复性的装置。平均covs地点1 ， 2及3条获得8.00 ， 4.48 ，
和3.52 ，分别为特殊保障和9.86 ， 8.03 ， 6.91 ，分别为中科院。成对t
检查则调查的意义，这些分歧的特殊保障和
中科院，那里虚无假设在每次测试的是平均covs都是平等和
替代假设是，他们不是平等的。试验取得了P值的0.280 ，
0.145和0.002 ，为地盘1 ， 2 ， 3 ，分别为。在标准误差率为0.05 ，这
表明了分歧，在冠状病毒之间的特殊保障和中科院在站点1和2是不是
显着性差异，但是，病毒的结构安全保证是小于的中科院在网站3 。
因为较低covs相关，重现性好等，这些分析表明，该

全面理财总值在2005年年度会议的光碟文件的修订，从原来递交。