The problem with human-resource managers is that they are human. They have biases; they make mistakes. But with better tools, they can make better hiring decisions, say advocates of "big data". Software that crunches piles of information can spot things that may not be apparent to the naked eye. In the case of hiring American workers who toil by the hour, number-crunching has uncovered some surprising correlations. For instance, people who fill out online job applications using browsers that did not come with the computer (such as Microsoft's Internet Explorer on a Windows pc) but had to be deliberately installed (like Firefox or Google's Chrome) perform better and change jobs less often.
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