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Michael,
do you use the same formula for other softwares ?
How do you compare EMA values ?
Have you used directly the weekly mode to obtain weekly EMA values,
instead of a non accurate daily formula ?
Just curious...
DT
PS. Amibroker calculations are accurate, AFAIK.
--- In amibroker@xxxxxxxxxxxxxxx, "Michael Orlyk" <bmwrider@xxxx>
wrote:
> Out of curiosity I decided to compare the accuracy of weekly EMA
> calculations against other programs. I had a niggling feeling that
I
> would find a disagreement. Not to my surprise the EMA values
> produced by AB did not agree with the values produced by three
other
> programs.
>
> The other three programs produced EMA values that agreed with each
> other but not with AB's results. I am now trying to find an
> explanation for the discrepency.
>
> Below,is the script I am using in AB to get weekly EMA values doing
> an explore on selected equities. For this test I am calculating a
30-
> week EMA.
>
> Filter = 1;
>
> ws = DayOfWeek() < Ref( DayOfWeek(), -1 );
> we = DayOfWeek() > Ref( DayOfWeek(),1);
>
> WCl = ValueWhen(we, Close);
> wv = ValueWhen(we, Sum(V,5));
>
> AddColumn(WCl, "Close");
> AddColumn(EMA(WCl,150), "EMA");
> AddColumn(Cross(WCl, EMA(WCl,150)), "Cross");
>
> Do I have an error in the above? Is there an inherent error in the
> process that I am unaware of? After I discovered this problem, I
no
> longer trust AB's results in so far as weekly calculations are
> concerned. Note that what I am doing involves processing in both
> weekly and daily timeframes so setting AB's periodicity to weekly
is
> not an option. Any comments would be appreiated.
>
> Mike O.
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