March 2007

Columns

HP Control: Inferential models that correlate but do not predict

A friend has asked me to help solve a dilemma. A neural net model developed in his plant had a near perfect fit against lab values but in spite of that the model's prediction ability was poor. I was s..

Friedman, Y. Z., Petrocontrol

A friend has asked me to help solve a dilemma. A neural net model developed in his plant had a near perfect fit against lab values but in spite of that the model's prediction ability was poor. I was sleeping on this for many nights trying to come up with a plausible explanation, and then one morning I found this on Yahoo financial news: "Researchers have found that the healthier you are, the richer you'll be. Find out why a robust body often leads to a strong bank account." Not a joke but a serious headline. The possibility that wealthy people could be healthier because they can afford a healthier environment and better health care is not even under consideration. It dawned on me that regr

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