Date:         Wed, 8 Jul 1998 16:27:42 -0500
Reply-To:     "Bauer, John" <bauer@SPSS.COM>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From:         "Bauer, John" <bauer@SPSS.COM>
Subject:      Re: Area Under the Curve; Trapezoidal Rule
Comments: To: "Van Kirk, Jeff" <VanKirk@PSYCHIATRY.UCHC.EDU>

SYSTAT 6.0 or higher will compute the area under the polygon generated
by a list of variables.  The variables may be equally or unequally
spaced.  In the latter case, the variables and time values are specified
in pairs.
 
For example:
 
        CALC ARE ( 10 20 40 80 )
        105.000
 
or for unequally spaced data (the first number is the x or time
coordinate, the second is the y coordinate):
 
        CALC ARU ( 2,1  4,20  8,15  16,2 )
        159.000
 
 
John Bauer, Ph.D.
SPSS Support Statistician
 
>-----Original Message-----
>From:  Van Kirk, Jeff [SMTP:VanKirk@PSYCHIATRY.UCHC.EDU]
>Sent:  Wednesday, July 08, 1998 1:29 PM
>To:    SPSSX-L@UGA.CC.UGA.EDU
>Subject:       Area Under the Curve; Trapezoidal Rule
>
>Does anyone know of a program or applet that will calculate the AUC
>using the trapezoidal rule?  I would like to compare two or more AUC's.
>Thanx
>
>Jeffrey R. Van Kirk
>Dept. of Psychiatry, UCHC
>263 Farmington Ave., Farmington, CT  06030
>(860) 679-3613
>(860) 679 1316 (FAX)