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KELLY'S
CRITERION
Here
you can find a teory which has been widely used to maximize
the profit of the capital in a long period.
Thanks to Kelly's formula we can quantify the
percentage of our capital, we need for eachbet.
Let's
check the formula:
(quotation x estimation- 1)/(quotation
- 1)
Multiplying the result by 100, we will obtain the percentage
of the Reserve Fund we should designh for the bet.
Example:
Amount we have to bet as a whole: € 1000
Quotation: 5.00
Estimation: 0.25 (25 %)
(5,00 x 0,25 - 1) / (5,00-1) = 0,0625
That means we'll have to bet the 6.25 % of our capital,
that is
€ 62,5
There are many constrasting opinions about this formula,
the person overworking it should have a great Reserve
Fund knowing that the expected profit could come in
a long period. Others consider this aspect as a risk,
in facts you should drop into high risks, in particular
if you overwork it considering "value" events,
in this case the percentage of the capital you need
to bet increases a lot.
Another choice you have is to overwork the subdivision
system dividing by 2 the percentage; in this way you
can minimize the risk.
You can also overwork Kelly's formula if you want to determine
proportion of the game, helping, ih this way, the gmabler
to decide how many coins he should bet on mark 1 or
on mark 2. This little trick could be analyzed considering
the followiing example
capital = 1.700
on mark 1 = 4%
on mark 2 = 2%
bet = 6%
amount to bet= 100
you should use:
4/6 = 66.7 on mark 1
2/6 = 33.3% on mark 2.
NOTICE
Wa have to state precisely a very important point, which
could pass unnoticed but which is very important and
basic alement for Kelly's theory.
The probable profit percentage does not reflect the true fairness
of the proportion between investment-profit, since quotations
the bookmaker offers are not reasonable, because they
take into consideration the profit every single gambler
retains.
I
link to the first section "how do quotations originate";
you should read it carefully.
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