initial proportion造句

These initial proportions changed over time as new sharers were added.
Suppose that he holds prior beliefs about these unknowns : for him the probability distribution of the urn content is well approximated by some prior distribution for the total number of balls in the urn, and a beta prior distribution with parameters " ( x, y ) " for the initial proportion of these which are black, this proportion being ( for him ) considered approximately independent of the total number.
It's difficult to find initial proportion in a sentence. 用initial proportion造句挺难的