| http://www.w3.org/ns/prov#value | - You want to determine whether this new medicine improves the prospects of people with heart disease, but if you set up an experiment and the test subjects are, on balance, healthy, then you are going to be led to a mistake in your inference about whether the medicine is effective or not.While this conundrum has been known for decades as the problem of confounding, Woodward says that it exemplif
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