externalmonologue comments on Parapsychology: the control group for science - Less Wrong

62 Post author: AllanCrossman 05 December 2009 10:50PM

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Comment author: MichaelVassar 08 December 2009 03:38:08AM 16 points [-]

I used to think that way before I knew about Bayesianism. Once I learned about it I realized that the prior probability for psi was very VERY low, e.g. its complex and there's no reason to expect it so one in a bajillion, while the probability for the observed evidence for psi, given what we know about psychology, was well in excess of 50% in the absence of psi, so the update couldn't justify odds greater than two in a bajillion.

Comment author: externalmonologue 27 November 2010 05:14:04PM 0 points [-]

One in a bajillion? You are saying you actually know how complex psi is without even saying what aspect of psi you are talking about.

We know biology is very complex. So when testing a supplement like creatine, the pseudoskeptic could say "biology is extremely complex. We do not know the mechanism that makes creatine work so I assign a very low bayesian probability. Today I feel like a hundred trillion to one".

Keep in mind this is after several studies have shown an effect in the predicted direction whose odds are not easily explained by chance. Indeed, there is nothing wrong with you assertion about complexity just the subjective part where you assign a number to a phenomena you are not very familiar with.

Comment author: wedrifid 27 November 2010 05:33:03PM 3 points [-]

One in a bajillion? You are saying you actually know how complex psi is without even saying what aspect of psi you are talking about.

Bajillion isn't exactly a precise measure. In this context it means 'lots'. That isn't hard to assign to the all aspects of psi.