Hi Steve --
I have not looked into the details of the differences. I have QP on one
computer, Norgate Premium on another. I like, and use, both.
When there are differences in the test results run on two data series that
should be, and appear to be, very close to each other, that is a flag to me
that the system I am testing is probably unstable.
Thanks,
Howard
On Sat, Jun 6, 2009 at 10:18 AM, Steve Dugas <sjdu...@comcast.net> wrote:
>
>
> Hi Howard - between QP and Norgate, just wondering if you ever followed
> up on the differences in data and if you found one to be noticably cleaner
> than the other? Thanks very much!
>
> Steve
>
>
> ----- Original Message -----
> *From:* Howard B <howardba...@gmail.com>
> *To:* amibroker@yahoogroups.com
> *Sent:* Saturday, June 06, 2009 12:41 PM
> *Subject:* Re: [amibroker] Re: Walk Forward Testing - Varies by Computer?
>
> Greetings --
>
> Check the settings being used.
>
> And test runs can be surprisingly sensitive to small differences in the
> data being used. I regularly find significant differences between runs made
> using Norgate Premium data and Quotes Plus data, although when I plot the
> two price series, I cannot see obvious differences.
>
> Thanks,
> Howard
>
> On Thu, Jun 4, 2009 at 5:03 PM, toddk63 <todd...@yahoo.com> wrote:
>
>>
>>
>> I just debugged a similar problem. Same system, same database, different
>> answer. Turned out to be the "Limit Trade Size" option on the "Settings"
>> dialog box. Default is 10, I need to set it to 0. I wish there were a
>> function like SetOption("LimitTradeSize"), but there is not...
>>
>>
>> --- In amibroker@yahoogroups.com <amibroker%40yahoogroups.com>,
>> "jacklweinberg" <jacklweinb...@...> wrote:
>> >
>> > Question:
>> > How is it possible for a walkforward test to produce different results
>> on two different computers?
>> > Background:
>> > 1. AB program, database, system, watchlist, walkforward settings etc.
>> are on a usb key that is moved from one computer to another.
>> > 2. Before the walk forward test, the same walkforward settings file is
>> loaded. The same system is executed. The results are also put into the same
>> usb key.
>> >
>> > Why do two different computers produce different results? (and strangely
>> enough, very different results!)
>> >
>>
>>
>
>
