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buybuydandavis comments on Help with Bayesian priors - Less Wrong
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Comments (26)
No. Use all information available. What problem are you actually looking to analyze? What information do you have?
That may be some useful information to include. Willfully ignoring relevant information, or not seeing how to use some information that seems like it may be relevant does not mean that the problem is "subjective", it means that we are often lazy and confused. And that's fine.
Include what you can transform into meaningful probabilities.
That thinking is hard is not a problem unique to bayesian methods.
Who decides on what information is relevant? If i said i want to use men without beards and Alexander never had one, that would be wrong (at least my intuition tells me it would be) as i am needless disregarding information that skews the results. You say use all the info but what about collecting info on items such as a sword or a crown. I feel that is not relevant and i think most would agree. But where to draw the line? Gram_Stone pointed me to the reference class problem which is exactly the issue i face.