# st: RE: Re: Area Under Curve

 From "Di Stefano, Paola" To Subject st: RE: Re: Area Under Curve Date Fri, 2 Mar 2007 17:22:02 +0100

```THANK YOU!!!!!
:-)

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Sergiy Radyakin
Sent: venerd́ 2 marzo 2007 17.14
To: statalist@hsphsun2.harvard.edu
Subject: st: Re: Area Under Curve

Hello Paola,

here is an example:
http://www.boomer.org/c/p3/c02/c0210.html

refer to the formula AUC(1-n)

*** Since you need only the area under the curve, but above 180, transform your data first:
replace c=(c-180)*(c>180)
*** c is your concentration variable
*** Since t(n)-t(n-1) is always 5 minutes, so you can simplify the calculations.
gen y=c
replace y=c[_n]+y[_n-1] if _n>1
di y[_N]/2*5

This will yield mg.min/L. If you want mg.hr/L, replace 5 in the last expression with 5/60, etc

Regards, Sergiy

----- Original Message -----
From: "Di Stefano, Paola" <paola.di.stefano@medtronic.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Friday, March 02, 2007 4:46 PM
Subject: st: Area Under Curve

> Dear all,
> Does anybody know how to calculate the Area Under Curve?
> I have two variables: time from 00.00 a.m. to 23.55 p.m. and glicemic
> values from 40 mg to 350 mg (every 5 minutes).
> I would like to estimate tha area above a limit of 180 mg.
> Any suggestion is welcome!
> Paola
>
> *
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> *   http://www.ats.ucla.edu/stat/stata/

*
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```