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.