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Tomasz answered with the following on the beta thread (where I'd
accidently posted this same question):
"
Hello,
Equity needs a SYSTEM code to generate equity values.
So you have to include your SYSTEM (buy/sell statements) before equity
() call.
Built-in equity function does that by using
#include @LastBacktestFormula
..........
"
-------------------------------------------------
Okay, that makes sense but now I'm wondering if there is any way I
can do what I was trying to do with the Equity function.
I'm trying to program a volatility based position sizing system that
always has a minimum number of positions (say MinPos=5) and where the
maximum position size never exceeds Equity()/MinPos (20% in this
case). The position sizing (NumShares) is defined to be some
function (multiple) of RiskCapital/ATR().
(Yes, this is the same issue I was wrestling with a week or so ago).
At that time, somebody suggested setting PositionSize = Max(-20,
NumShares*BuyPrice). After some thinking, though, I think this
overrides the position sizing desired because if the 20% is exceeded,
it just ignores the volatility based sizing and gets the maximum
number of shares allowed by the 20%.
So what I was trying to do with Equity was to predetermine the number
of shares I could buy for my risk and then making the 20%
constraint part of my Buy criteria. Something like the following:
Buy = cond1
AND cond2
AND NumShares*Open < .20*Equity()
...
So if it fails that test, I just go find another stock that does work.
But if Equity doesn't work as I thought, does anybody know how to
accomplish something like this?
Dan
--- In amibroker@xxxxxxxxxxxxxxx, "danielwardadams"
<danielwardadams@xxxx> wrote:
>
> Why doen't the following plot my equity line while the Equity graph
> selectable from the AA window works fine?
>
> Plot(Equity, "Equity", colorBlue, styleLine ) ;
>
> Instead it just plots a flat line with the value I used for
> InitialEquity (in SetOption).
>
> Also, why aren't the following two things equivalent?
>
> PositionSize = .20*Equity ;
> PositionSize = -20 ;
>
> I've tried most variations of Equity parameters to no avail.
> Obviously there's something about Equity() I don't understand.
> Apppreciate any help.
>
> Dan
>
> (I apologize if a variation of this message appears twice. A lot of
> times when I hit Send, it never makes it to the thread (??).
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