should we accept more risky double in the beginning than at the end?

[anonnymonk]

hi everyone,
it seems that XG dont have a progressive accept/pass related to pips count.
so i would like to know if a statistics freak could answer that question in the title.
does the possibility of doubling back is not to take into consideration in the statistic..
to me, its clear that i have more chance to accept a 30% win double in the begininng of a game instead that at the end, as i will have more opportunity to go above 50% and double back, than at an end game.
what statistics said about that? am i wrong to thing like that?
thanks