Predictive analysis can be useful at times, however there can be negative points for it also. A fairly recent example of it would be when during the presidential election, Donald Trump only had a 15 - 30 percent chance of being elected president and look at what happened there. The source that claimed only a 15 - 30 percent chance was from the polls, which is where the problem occurs, this is one of several inaccurate sources of information for such an event. These type of inaccurate information sources are the problem with predictive analytics, another example of inaccurate information which cannot be wholly trusted are surveys. Not everyone will answer a survey truthfully, be it lying or maybe being self conscious, using information from surveys such as this will be taking and using false, or inaccurate data and can do more harm than good in conjunction with big data. These are just a few of the different types of discrepancies you can find when using predictive analytics.
https://www.dummies.com/programming/big-data/data-science/the-limitations-of-the-data-in-predictive-analytics/
https://www.dataversity.net/limitations-predictive-analytics-lessons-data-scientists/#
https://www.dummies.com/programming/big-data/data-science/the-limitations-of-the-data-in-predictive-analytics/
https://www.dataversity.net/limitations-predictive-analytics-lessons-data-scientists/#
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