Date: Thu, 17 Jul 2003 06:37:55 -0700
Reply-To: Rick <rcjohnso@US.IBM.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Rick <rcjohnso@US.IBM.COM>
Subject: Use SAS to evaluate equation
Content-Type: text/plain; charset=ISO-8859-1
I've just run a PROC REG, and have the constants for a cubic equation.
Example: a + bx + cx**2 +dx**3
I have a dataset called REG where a,b,c,and d are defined. Now I want
to evaluate the equation to find the MAX point in the curve.
The obvious way to do this is to create a new dataset, calculate a
number of points, then do a PROC MEANS to find the max.... TONS of
work, especially if I want accuracy...
Is there some easier way to do this???
On my calculator I can do something like this:
MAX(a + bx +cx**2 + dx**3), -.5, .5
parm[equation],[min range, max range]