Mathematical Expectation for a trading system

Hi Mark,
You are right: it is P = #winners / #trades
Thank you,
-Mark-

2009/10/16 Mark Knecht <markknecht at gmail.com>

On Fri, Oct 16, 2009 at 2:46 AM, Mark Breman <breman.mark at gmail.com>
wrote:

I think I found the answer for calculating the Mathematical Expectation
(as
intended by Ralph Vince):
P = #winners / # losers

Is it #winner/#losers or is it #winner/#trades ?

Either can be true but I think the latter is more common in my
experience as it yields a value between 0 and 1.

good luck,
Mark