Thank you, Eugene. This looks quite simple, but interesting. Especially the 
summation of all trade drawdowns is new to me.
On the other hand, the sandard deviations of the returns and the number of 
trades is irrelevant for APD. These are, among the returns, the 
cornerstones of PI.
The best thing would be to have a combination of these two measurements. 
What do you think?
 
What concerns my drawdown code: Today at 14:30 exchange time I had a ES 
short trade @1696.5  and the maximum adverse movement, taken from the IB 
bid/ask chart was @1697, that means 0.5 points. This would correspond to a 
drawdown of about $25, but $50 was shown. However, some time ago I could 
verify that the IB charts are not always correct (i.e. Bloomberg trades 
were not shown on the chart), and it is well possible that a price @1697.5 
was feeded once to JBookTrader, which subsequently was not shown on the IB 
chart. The long trade earlier this day at 10:34 showed a drawdown of $88, 
and when consulting the IB chart, it should be $75, because the maximum 
adverse movement was at $1.5. but this again could be a problem with IB 
charts. Anyway please take a close look at my code.

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