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For mining employee performance to help stanch turnover and upend HR. Big data is also changing the way companies hire and manage their workforces. Like other HR software, Cornerstone helps employers better understand employees and job candidates by comparing their skills, work experience, and personalities. But Cornerstone takes it to a deeper level, crunching more than 500 million data points on gas prices, unemployment rates, and social media usage to help clients like Xerox—who has cut attrition by 20 percent—predict, for example, when an employee is most likely to leave his job.