Big Data analyses depend on starting with clean data points

Popularly referred to as "Big Data," mammoth sets of information about almost every aspect of our lives have triggered great excitement about what we can glean from analyzing these diverse data sets. Benefits range from better investment of resources, whether for government services or for sales promotions, to more effective medical treatments. However, real insights can be obtained only from data that are accurate and complete, so it's critical to keep in mind how the data were collected.

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