Of the human error factors at play, one of the most noteworthy is crew fatigue, which is responsible for about 25 percent of train accidents nationwide. (ryinjury.com)
Plus, all three firms rely, at least in part, on self - reporting by individuals — making human error a factor. (businessinsider.com)
Without getting too involved in a statistical analysis, a constructive way to look at the two data sets above would be to consider how a nominal error factor in each dataset might influence the results. (skepticalob.com)