Although data-snooping bias can occur in any field that uses data mining, it is of particular concern in finance and medical research, both of which make heavy use of data mining techniques. Any relationships found might appear to be valid within the test set but they would have no statistical significance in the wider population.ĭata dredging and data-snooping bias can occur when researchers either do not form a hypothesis in advance or narrow the data used to reduce the probability of the sample refuting a specific hypothesis. Data-snooping bias is a form of statistical bias that arises from this misuse of statistics. (September 2007)ĭata dredging ( data fishing, data snooping) is the inappropriate (sometimes deliberately so) use of data mining to uncover misleading relationships in data. Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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