117
Evidence for Risk Factors
A certain color/pattern must be my favorite if
•(Time
based observations)
–I come in more often when that color/pattern is in the
urn
•You
need not consider what else is in the urn
•(Risk
set based observations)
–I choose that color/pattern with a frequency disproportionate
to its frequency in the urn
•If I am blind to a characteristic, my choices should look
like random sampling
•You
need not consider the times that I come in