December 2007

Columns

HP Control: Inferential controls that correlate but do not predict

I recently received a letter from Pavlos Ioakimidis of Hellenic Petroleum responding to my editorial about inferential models that correlate but do not predict.1 That March editorial argued that regr..

Friedman, Y. Z., Petrocontrol

I recently received a letter from Pavlos Ioakimidis of Hellenic Petroleum responding to my editorial about inferential models that correlate but do not predict.1 That March editorial argued that regression-based inferentials do not necessarily discriminate between cause and effect, and hence, may be improper to use. Upon reading the letter I realized that my statement was not accurate and should be modified. Pavlos' letter (with minor editing modifications) follows. "Your argument was that inferentials that are not based on the actual root causes of a physical property, eventually fail to predict. To visualize that you presented the example of reformate RON that shouldn't be correlated

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