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Grunweld
20 Jan 10 10:46
Joined:
Date Joined: 17 May 03
| Topic/replies: 465 | Blogger: Grunweld's blog
Well, at least if your strategy uses x-feeder, which I think applies to a lot of folks on here.

This month an update should be announced, that will allow x-feeder to backtest against the BF data files. Just imagine checking your strategy against all the games that have been played. Apparently the module will generate all mid-game prices, that are missing from the data. Let's hope the actual update appears soon, so that we can eventually discover the answer to the ultimate question - does a profitable strategy actually exist?
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Report Tsoccerskills January 20, 2010 11:09 AM GMT
about bloody time 2! have u tried ameoba for back testing
Report Grunweld January 20, 2010 11:19 AM GMT
I've used Amoeba, but this is limited to files that you have saved by running the bot or downloaded from another user, so is limited for backtesting. If x-feeder can pull it off, then it will be the ultimate tool - no more live testing to see if something works.
Report Jazza January 20, 2010 3:48 PM GMT
Sounds good but I think I know the answer already.
Report slaxon January 20, 2010 4:38 PM GMT
All my xmas's would come at once if I could backtest a trig against thousands upon thousands of games. I never appreciated how important a feature this would be until I started using amoeba. Trigs that had promise would fail and others that failed short term despite being good on paper proved profitable 'long term'. If xfeeder does pull it off, it would be a massive coup for them. I would expect it to attract a lot of new players to the x games.
Report FINE AS FROG HAIR January 20, 2010 5:24 PM GMT
Or alternatively, as Jazza suggests above, put the nail in their coffin once and forever.
We shall see.
Report Grunweld January 20, 2010 5:59 PM GMT
If this does prove successful for x-feeder, I'm hopeful that it will be extended to Welldone's sports product Marketfeeder Pro. Now that would be a coup.
Report FINE AS FROG HAIR January 20, 2010 7:15 PM GMT
Let me pose the following.
If one finds a strategy that backtests profitably over a very large number of games then, if the strategy is not explainable in terms of there being a clear, understandable mathematical edge ( that is the odds are clearly wrong), will this test simply mean that if and when one goes live that the future games will probably result in a loss to compensate for the extraordinary successful backtest results ?.
That is , a reversion to the mean will occur and the more successful the backtest the more vicious the future loss is likely to be in live mode ?.
A very,successful backtest could in fact be the ultimate undoing of many ?
Report Grunweld January 20, 2010 7:48 PM GMT
Although possible, I don't believe that mean reversion cycles will be longer than all the games played. But who knows, I certainly have a few strats I would like to test against at least 100K games. It would be nice to have an answer, although I would agree that the conclusion can never be absolute.
Report Tsoccerskills January 20, 2010 8:06 PM GMT
well good on x feeder if they do it! also they can improve getting 100% of my bets! instead of 90%!
Report FINE AS FROG HAIR January 20, 2010 8:37 PM GMT
I suppose Grunweld that one should cross bridges as one comes to them.
That is find the successful long term backtested strategy first and then worry about the rest then.
Btw I only proposed my thought in connection with those strategies that have no clear, mathematical reasoning underlying them.
Also I have only proposed it, because it is something that I worry about all the time.
That is am I only setting myself up for a big fall one day by backtesting numerous strategies endlessly ?.
Report Ivy January 21, 2010 9:14 PM GMT
FAFH
"...future games will probably result in a loss to compensate for the extraordinary successful backtest results..."
Is this a shift towards the Mean reversion theory and away from the 'Gambler's Fallacy'? Does the RNG really have a memory? Can this be explained mathematically?
Report FINE AS FROG HAIR January 22, 2010 1:39 AM GMT
Not at all.
Everything reverts to the mean over time.
You just can't make money out of that simple, unquestionable fact, because of the odds spread and commission.
Report Jazza January 22, 2010 3:44 PM GMT
and you might have to wait 200 years?
Report FINE AS FROG HAIR January 22, 2010 4:58 PM GMT
Patience is a virtue Jazza ?
But not in the case of appyling a mean reversion strategy to Xgames.
The sometimes snail pace of a reversion means that the commission kills you.
A classic case of so close yet so far.
Report Ivy January 22, 2010 7:57 PM GMT
So, let's get this clear, if a series of results runs away from the expected odds, we can rely on future results to bring it back?
So if in blackjack, the dealer wins 8 out of 10 times, can we be sure that it won't keep doing that?
Does it mean that we can make some predictions because of statistical maths?
Report Grunweld January 22, 2010 8:21 PM GMT
You can be sure that the dealer won't keep winning at that frequency. But we cannot predict how many games it will take the for the frequency to normalise. All we know is that over a large enough number of games the frequency of wins will be as expected from the true odds of 3.76. The more games observed, the closer it will get to these odds.
Report FINE AS FROG HAIR January 22, 2010 10:40 PM GMT
Exactly.
As Grunweld says essentially it can revert virtually to the norm, for example, simply by occurring in the future at the correct probability for a long time.
No way to make money out of that sort of prediction unfortunately.
Report Jazza January 22, 2010 11:18 PM GMT
as I said, it may take 200 years. Too long for me.
Report ludyburrows March 4, 2010 6:27 AM GMT
Isn't Jazza just a really happy fricking bunny.

Time he developed a brain.
Report Feeder March 4, 2010 9:30 AM GMT
Can all of you tell me what channel is your priority at the moment, if not Poker?
Report Grunweld March 4, 2010 11:12 AM GMT
Well my main interest is in Omaha mainbets, but I suspect that will be at the bottom of anyone's list.

Next would be Blackjack, Baccarat (main and side), HiLo and Card Derby - in that order.
Report slaxon March 4, 2010 4:09 PM GMT
BJ, hilo and bcct, in that order please.
Report Jazza March 4, 2010 6:35 PM GMT
ludyburrows 04 Mar 07:27

Isn't Jazza just a really happy fricking bunny.

Time he developed a brain.


This may surprise you, but a developed brain can evolve to a point where it can deal with all sorts of emotions. Happiness is but one.

Keep smiling
Report YOULITTLEBOTTY March 4, 2010 7:36 PM GMT
Your posts keep me smiling Jazza.
Keep em coming.
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