8/25/2023 0 Comments Define data dredging![]() Judging by their content, I think I may have not explained my question well enough. My hope is that not only a better understanding of the distinction between exploration and snooping/torturing, but also, and more importantly, a better grasp of principles and techniques for detecting when that line has been crossed, will allow me to evaluate such findings in a way that can reasonably accounts for a less-than-optimal analytic procedure, and thus be able to go beyond my current rather simple-minded response of blanket disbelief.ĮDIT: Thank you all for the very interesting comments and answers. Unfortunately, my limited understanding of the do's and don'ts of data analysis keeps me from going beyond such vague doubts, so my conservative response is to basically disregard such findings. Of course, there's usually some "validation" thrown in the final report/paper to show that the statistical analysis is on the up-and-up, but the blatant publish-at-all-cost attitude behind it all leaves me doubtful. Here's the typical scenario: costly experiment gets carried out (without much thought given to the subsequent analysis), the original researchers cannot readily discern a "story" in the gathered data, someone gets brought in to apply some "statistical wizardry", and who, after slicing and dicing the data every which way, finally manages to extract some publishable "story" from it. In my line of work I often come across what looks to me like rampant "data snooping", or perhaps it would be better described as "data torture", though those doing it seem to see the same activity as entirely reasonable and unproblematic "exploration". On the other hand, "exploratory data analysis" seems to be a perfectly respectable procedure in statistics, at least judging by the fact that a book with that title is still reverentially cited as a classic. ![]() Usually when this happens in a large development part of the process to obtain zoning approval involves negotiating a conservation easement over the private submerged lands to make sure they are not destroyed through activities such as dredging or rows of docks.Many times I have come across informal warnings against "data snooping" (here's one amusing example), and I think I have an intuitive idea of roughly what that means, and why it may be a problem. Warren Beatty Shampoos the Sleazy 90's 1998 You may think it's just the return of the radical chic, but it's such an ambitious movie that it's a kind of dredging up of a part of history that was lost. The Dutch experience of sea-level rise « Climate Audit 2005 The standardization of measurement is not well defined: The effect of counter measures such a dredging which is performed intensively in Holland is difficult to asses. GOP Earmark Ban Shifts Clout Jonathan Weisman 2010īouchet said data was collected using both academic and traditional methods such as dredging and trawling, diving and deep-water nets which Panglao fishermen traditionally use. Lawmakers may still say how money is budgeted generally for activities such as dredging, but by banning earmarks - specific projects funded as a result of lawmakers ' requests - they won ' t be able to direct cash to individual districts or states. Sixty thousand cubic yards of silt and sand is to be removed in the inner-harbor dredging, which is expected to cost about $2 million. Tim Havens, longtime president of the anti- dredging group CEASE, cited the shortcomings in calling the dredging a "miserable failure." It's a pure case of data dredging, which is when statisticians take a huge compilation of data and manipulate the numbers to include only those which verify some hypothesis they set out to prove. The dredging was a test run for the far larger Phase 2 of the cleanup, which regulators want to start in 2011. Stories of Great Inventors Fulton, Whitney, Morse, Cooper, Edison Hattie E. He invented a mill for sawing marble, a machine for spinning flax, another for scooping out earth, called a dredging machine, and several kinds of canal boats.
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