![Data dredging.](https://cdn1.cdnme.se/5447227/9-3/20_64e61dfc9606ee7f8b257166.png)
![data dredging. data dredging.](https://cdn.offshorewind.biz/wp-content/uploads/sites/11/2022/07/12122012/Registration-open-for-the-IADC-Dredging-Seminar-in-Singapore-1024x679.jpg)
![data dredging. data dredging.](https://www.explainxkcd.com/wiki/images/3/3f/significant.png)
This level of risk is called the significance.
![data dredging. data dredging.](https://5.imimg.com/data5/TH/DI/MY-40325088/dredging-survey-500x500.jpg)
The process of data dredging involves testing multiple hypotheses using a single data set by exhaustively searching-perhaps for combinations of variables that might show a correlation, and perhaps for groups of cases or observations that show differences in their mean or in their breakdown by some other variable.Ĭonventional tests of statistical significance are based on the probability that a particular result would arise if chance alone were at work, and necessarily accept some risk of mistaken conclusions of a certain type (mistaken rejections of the null hypothesis). Misuse of data analysis A humorous example of a result produced by data dredging, showing a coincidental correlation between the number of letters in Scripps National Spelling Bee's winning word and the number of people in the United States killed by venomous spiders.
![Data dredging.](https://cdn1.cdnme.se/5447227/9-3/20_64e61dfc9606ee7f8b257166.png)