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If the OP wants to compare % change over time, then you are correct.
However, if he truly wants to compare slope, and only slope, then the calculation below does that.
It really depends on what he wants to compare in his system. Maybe as far as his system in concerned, a one point rise over one bar, whether the underlying symbol is priced at $10 or $100, is considered equivalent. I've written some systems like that - where I am only interested in the true slope of price action. And in other systems, I use a normalized approach to get % change, in which case the underlying price makes a difference.
--- In amibroker@xxxxxxxxxxxxxxx, "Ed Hoopes" <reefbreak_sd@xxx> wrote:
>
> In your post you say you want to COMPARE slopes. If you are really comparing, you need to calculate the percent change over time. That is you need to normalize the price of the stock to some constant number - say 100 - as in percent.
>
> The reason for this is that a one point change in a security priced at 10 is 10%. The same one point change in a 100 is only a 1% change. Yet in the calculation below they would have the SAME SLOPE. Not good.
>
> ReefBreak
>
> --- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" <zoopfree@> wrote:
> >
> > Slope is rise/run
> >
> > so for e.g., the slope of the Close over two bars is:
> >
> > SlopeC = 10000*(C-Ref(C,-2))/2;
> >
> > 10000 factor used to make numbers whole.
> >
> > Or for e.g. the slope of an MA over two bars:
> >
> > myMA1 = MA(C,4);
> >
> > SlopeMA1 = 10000*(myMA1-Ref(myMA1,-2))/2;
> >
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "murthysuresh" <money@> wrote:
> > >
> > > http://screencast.com/t/cXNaG3qxX
> > > i have marked what a nice slope is and what is not. i want to use the 9 ema and compare the slope. how do i do it.
> > > any ideas?
> > >
> >
>
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