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st: RE: Re: Area Under Curve
THANK YOU!!!!!
:-)
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Sergiy Radyakin
Sent: venerd� 2 marzo 2007 17.14
To: [email protected]
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" <[email protected]>
To: <[email protected]>
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
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
