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Fracking and Baysean Calculator

August 11th, 2015

Well, we can use the Bayes Probability Theorem to figure out how likely is is that fracking will pollute our water supply.

Suppose the probability of fracking polluting the water supply in any one spot–say, within 500 yards of the fracking site–is originally estimated, before any evidence of pollution has been found, to be only 0.5%.

Now an event happens, such as the real event: water coming from a tap in a house, which draws its water from a well, starts to ignite when an open flame is brought near it.

What are the chances that the fracking caused the pollution?  We can estimate that there is about a 40% chance that fracking is the cause.  We can also posit that, without the fracking, natural causes might cause the water to become polluted; but it’s very rarely that a water supply spontaneously becomes flammable, so let’s put that possibility at 0.05%.

Plugging these values in to the Bayesean Theorem; x=.5, y=50%, z=0.05%

Bayesean Theorem:  P = xy / xy + z(1-x)

Solving for P :  There is a 83% chance that fracking will pollute the water supply.

That is not a trivial possibility.

You can play with these figures, using my Bayesean Calculator.  In any case, you will not find the possibility of pollution from fracking to be anything but frightening.

Hey, nothing wrong with that, right?

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