RE: [GT] ADX

[kw <gt AT netsrak.net>]

Hello Thomas,

did you take a look at WWMA.pm?
this should be a wilders smooting as well but it starts with Price at
"$period ago +1" and starts wilders smoothing from there on ... 

Might this be the source of difference when comparing to ta_lib??

regards,

K.

On Mon, 2008-03-03 at 08:08 -0600, Weigert, Thomas wrote:
> I always check my indicators against TA_LIB in Excel. In the case of ADX
> I found disagreement, as described below among many sources including
> TA_LIB.
> 
> Th.
> 
> > -----Original Message-----
> > From: kw [mailto:gt
AT
netsrak.net]
> > Sent: Monday, March 03, 2008 1:26 AM
> > To: devel
AT
geniustrader.org
> > Subject: Re: [GT] ADX
> > 
> > Hello GTers,
> > for checking Indicators one could use the chart-47 I proposed earlier
> or
> > one could rely on qtstalker (which would be a convenient way of
> checking
> > against ta-lib).
> > Another option would be the yahoo chart-tool.
> > 
> > At the weekend I asked my self if it would make sense to try to get a
> > swig wrapped ta-lib working in GT? I don't know if this can work
> either?
> > 
> > What's interesting as well is to pull the ta-lib svn sources, cause
> > there are Excel implementations for many indicators included.
> > 
> > regards,
> > 
> > K.
> > 
> > 
> > On Mon, 2008-03-03 at 00:21 -0600, Weigert, Thomas wrote:
> > > Does anybody know a reliable way of checking the behavior of the ADX
> > > indicator?
> > >
> > > As implemented it does not match the corresponding indicators in
> tools I
> > > have access to (Metastock, EclipseTrader, TA_LIB). Note that none of
> > > these agree with each other either.
> > >
> > > I reimplemented it based on the description that I found in
> metastock,
> > > but that does not match the original implementation, nor the other
> ones
> > > listed above either.
> > >
> > > I realize that there might be differences due to whether Wilder's
> > > smoothing is used or EMA or SMA, but the values obtained in the
> various
> > > implementations are too inconsistent.
> > >
> > > I am attaching my new version, if you care....
> > >
> > > Th.
>