# Historical draw down reporting **URL:** \ **Category:** C2\ **Created:** [September 17, 2009, 2:19am UTC](https://forums.collective2.com/t/historical-draw-down-reporting/7021 "2009-09-17T02:19:57Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![LindaDavenport](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/lindadavenport/32/941_2.png) [@LindaDavenport](https://forums.collective2.com/u/LindaDavenport)\ **Post date:** [September 17, 2009, 2:19am UTC](https://forums.collective2.com/t/historical-draw-down-reporting/7021/1 "2009-09-17T02:19:57Z")
9/2/09 8:53 LONG 10 GBP/JPY 149.908 9/2/09 9:37 149.980 Normal $77 The above trade constitutes a 4.22% drawdown for Nitro(i), right? Why then their maximum historical dd is reported as 1.5%?[LINKSYSTEM\_42749302] ---
**Author:** ![MatthewKlein](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/matthewklein/32/21382_2.png) [@MatthewKlein](https://forums.collective2.com/u/MatthewKlein)\ **Post date:** [September 17, 2009, 8:47am UTC](https://forums.collective2.com/t/historical-draw-down-reporting/7021/2 "2009-09-17T08:47:02Z")
I’m not sure that anything has changed regarding how max trade-by-trade drawdowns are calculated. But if you have a few examples I can look at in your system that you think are incorrect, please let me know so I can investigate. Thanks ---
**Author:** ![JohnnySmith](https://avatars.discourse-cdn.com/v4/letter/j/ad7895/32.png) [@JohnnySmith](https://forums.collective2.com/u/JohnnySmith)\ **Post date:** [September 17, 2009, 10:29am UTC](https://forums.collective2.com/t/historical-draw-down-reporting/7021/3 "2009-09-17T10:29:18Z")
Linda was asking a different question. She was asking why the system-wide max drawdown stat can be different than a trade-by-trade max drawdown. She was not questioning the validity of the trade-by-trade drawdown calculation, which (I think) is what you are doing. I am simply asking: If you think a trade-by-trade drawdown stat is incorrect, tell me which one I can look at to investigate. ---
**Author:** ![MatthewKlein](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/matthewklein/32/21382_2.png) [@MatthewKlein](https://forums.collective2.com/u/MatthewKlein)\ **Post date:** [September 17, 2009, 10:56am UTC](https://forums.collective2.com/t/historical-draw-down-reporting/7021/4 "2009-09-17T10:56:22Z")
Maybe this is just a problem with terminology. I don’t know what floating drawdown means. What I can tell you is that C2’s max drawdown stat has no relation to trade-by-trade drawdown. Rather, we just take equity snapshots through the day and use that as the basis for system-wide max drawdown. So of course this implies there is a chance that we will miss a moment when a true low (or high) occurs. ---
**Author:** ![LindaDavenport](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/lindadavenport/32/941_2.png) [@LindaDavenport](https://forums.collective2.com/u/LindaDavenport)\ **Post date:** [September 17, 2009, 11:53am UTC](https://forums.collective2.com/t/historical-draw-down-reporting/7021/5 "2009-09-17T11:53:46Z")
Matthew, I do not have a system on C2. I have several systems on my analyst page. I study their trades carefully as a part of my portfolio selection process. To me, so far, your draw down computation algorithm is a complete mystery ! It appears that the algorithm’s performance is not completely uniform across the systems on my page. I gave you one example - Nitro(i), where an intratrade dd was 4.22%, while C2 had reported it at 1.5%. It is the worst discrepancy I have found so far. We, the subscribers, are looking up to C2 to report the dd accurately, since it is the major factor affecting our decision process. Thank you. ---
**Author:** ![MatthewKlein](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/matthewklein/32/21382_2.png) [@MatthewKlein](https://forums.collective2.com/u/MatthewKlein)\ **Post date:** [September 17, 2009, 12:04pm UTC](https://forums.collective2.com/t/historical-draw-down-reporting/7021/6 "2009-09-17T12:04:14Z")
I think my answer above still applies: system-wide maximum equity drawdown is calculated independently of trade-by-trade maximum adverse excursion calculations. So it is possible for a single trade to have a higher drawdown than is shown on the system-wide max drawdown stat.