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The start value must be the denominator. Whether its larger or smaller justaffects the sign of the outcome (numerator). You have to accept that the result can be negative ie a decrease, as well as positive. If you only want the magnitude square the no. and take the sqrt.
If a is the start value 5 and b is the end value 7 then the % increase is
40%.
% = (7-5)/5 = 2/5 = 0.4 = 40% increase.
If a was 7 (ie start at 7) and b = 5 (ie the end value)
% = (5-7)/7 = -2/7 = - 0.286 = 28.6 % decrease.
Original Message:
-----------------
From: Tom Presley tpresley@xxxx
Date: Wed, 07 Mar 2001 18:30:40 -0500
To: amibroker@xxxxxxxxxxxxxxx
Subject: RE: [amibroker] Percent - Math 101?
<html><body>
<tt>
This still assumes you know which value is larger. In this case, the below <BR>
formula does not work:<BR>
<BR>
a=5<BR>
b=7<BR>
<BR>
(7-5) / 5 = .4 (incorrect)<BR>
<BR>
<BR>
>If a is the start value and b is the end value then you could use<BR>
><BR>
>Percent Change = (b-a) / a<BR>
><BR>
>If the change is a decrease the answer is negative. If the change is an <BR>
>increase the answer is positive.<BR>
<BR>
<BR>
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