Re: Welles Wilder's Relative Strength Index (RSI)

[Vitaly Larichev <vitaly@xxxxxxxxxxxxx>]

Glen,

I am reposting my old repost of my previous repost, ....  :-)  .
Hope it's what you are asking about.

So, here it goes.



-------- Original Message --------
Subject: RSI formula for an indicator.
Date: Sun, 14 Sep 1997 01:28:21 -0700
From: Vitaly Larichev <vitaly@xxxxxxxxxxxxx>
Reply-To: vitaly@xxxxxxxxxxxxx
To: michael.arnoldi@xxxxxxxx

Mike,
      
        The following is my recent post on the issue. Put for P below
any indicator you want. Ask, please, if any questions.

                Cheers, Vitaly


     Subject: 
             Re: Anyone know full RSI formula in metastock language???
 Resent-Date: 
             Mon, 25 Aug 1997 21:13:52 -0600
Resent-From: 
             metastock-list@xxxxxxxxxxxxx
       Date: 
             Mon, 25 Aug 1997 22:49:27 -0700
       From: 
             Vitaly Larichev <vitaly@xxxxxxxxxxxxx>
         To: 
             metastock-list@xxxxxxxxxxxxx
  References: 
             1 , 2


Dennis,

The following is copied from Formula Field of my 
*RSI canonical_12_day_for_P_I indicator. Change m if you choose another
# of periods n for rsi.

Good luck with your project,
                                Vitaly


{I wrote my own "canonical" RSI(12) which coincides with MS's RSI(12) if 
m=2*n-1 where m is used below in Mov( ,m,E); n - a number of periods in 
rsi(n). Mind that since I didn't use those particular tricks from the 
standard rsi(n) to shorten the initial transitional period, this
function and standard rsi(n) differ for about month or so from the day 1. It was not
that important for me, so I used this shortcut.}

100 - 100/
(1.+ If(Mov(If(P-Ref(P,-1)<0,-(P-Ref(P,-1)),0),23,E)=0,1000000,

 Mov(If(P-Ref(P,-1)>0,  P-Ref(P,-1), 0),23,E)
/Mov(If(P-Ref(P,-1)<0,-(P-Ref(P,-1)),0),23,E)
))


dburkey@xxxxxxxxxxxxxxxx wrote:
> 
> Does anyone know the full formula for the RSI (relative strength
> index)?,
> 
> I know that metastock just uses rsi(length), but I'm trying to take the
> rsi of another indicator, not the close.
> 
> I've looked in a few books but I don't know how to translate the formula
> into metastock language.
> 
> Omega Research lets you simply use RSI(x, length), where x can be
> anything, even other indicators.
> 
> Please help... I'm stuck right in the middle of a project.
> 
> Thanks,
> 
> -dennis