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Re: Let do probability! [Re: Hummel] #394701
02/15/12 20:38
02/15/12 20:38
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PrenceOfDarkness Offline OP
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The law of large numbers hummel


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Re: Let do probability! [Re: PrenceOfDarkness] #394702
02/15/12 21:42
02/15/12 21:42
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Hummel Offline
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ok...thatīs a strange answer to the question of why you donīt make use of this law, or did I miss something?

Re: Let do probability! [Re: Hummel] #394705
02/15/12 22:31
02/15/12 22:31
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The law of large numbers in a nut shell means that no matter how many trials I use it wont matter because that can be just a small percentage when compared to something like infinity.

Say you take a coin and you flip it not just a few million times but a few billion, no a few trillion times. Well there is nothing stopping the results to end up being 75% heads and 25% tails because when compared to infinity even a few hundred trillion can be considered a small trial.

In other words you can't reliably determine the probability of something just by running trials. If you've ever played a game with a rare item drop you know how gay it can be.. a 1in100 drop might not trigger until the 275+ time or more. Or you might get it on the 1st kill.

put another way, the only way you'll ever truly get a 50% heads and 50% tails result 100% of the time is if you flip the coin an infinite number of times. There is no large number when comparing to infinity.

Last edited by PrenceOfDarkness; 02/15/12 22:34.

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Re: Let do probability! [Re: PrenceOfDarkness] #394706
02/15/12 22:37
02/15/12 22:37
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Quote:
Idk, that seems wrong to me for some reason. Anyone else have a take on it? It just looks a bit too simple

Then find a counterexample (i.e. with a minimal amount of balls) that the quote is wrong.


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Re: Let do probability! [Re: Superku] #394707
02/15/12 23:25
02/15/12 23:25
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PrenceOfDarkness Offline OP
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Trust me I've looked for it superku wink I'm having no luck. For some reason the only things I can find are wikiapedia entries which the math entries are always hard to read for me. I don't understand how they present the formulas.


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Re: Let do probability! [Re: PrenceOfDarkness] #394710
02/15/12 23:51
02/15/12 23:51
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Hummel Offline
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Quote:
The law of large numbers in a nut shell means that no matter how many trials I use it wont matter because that can be just a small percentage when compared to something like infinity.

Seams to be the opposite to what Wikipedia says:
Quote:
In probability theory, the law of large numbers (LLN) is a theorem that describes the result of performing the same experiment a large number of times. According to the law, the average of the results obtained from a large number of trials should be close to the expected value, and will tend to become closer as more trials are performed.

Of course there is a chance to get 75% heads and 25% even with a few million trys but the probability converges to zero.
Also you have to compare the amount of trys to the amount of possible results you can get for one try. Not to infinity.

In less than 10 minutes of coding you could get reference results which would tell you what solution might be the right (if the random-func you use is good).

Re: Let do probability! [Re: Hummel] #394713
02/16/12 00:25
02/16/12 00:25
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PrenceOfDarkness Offline OP
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yea that's part of it but it should also go on to explain that it wont really matter how large a finite number is.

Quote:

In less than 10 minutes of coding you could get reference results which would tell you what solution might be the right (if the random-func you use is good).


you make a perfectly valid point in that case.

I'd still would like to know with no doubt how to do this mathematically for my own person growth/education.


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Re: Let do probability! [Re: PrenceOfDarkness] #394988
02/18/12 17:16
02/18/12 17:16
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Joey Offline
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that's an easy question. just build a probiablity tree and add the branches that yield the wanted experimental outcome. shouldn't take you more than 5 minutes.

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