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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: Calculating area under a curve |

Date |
Thu, 3 Dec 2009 17:49:28 -0000 |

It's kind of you to thank us all but you do not distinguish between quite different comments. Others can speak for themselves for Steve (Samuels) and I couldn't see why this would be interesting or useful. (Steve's at liberty to dissent if that's not his view.) In effect, you are integrating twice, as -cumul- is clearly numerical integration of the density function, even though not named as such, and you then integrate once more. Could you please explain why this is a good idea? Nick n.j.cox@durham.ac.uk Padmakumar Sivadasan Thank you all (Martin, Philippe, Nick, Steve, Maarten, Bob) for your valuable suggestions! As suggested, I used -cumul- to calculate the cumulative distributions and -integ- to calculate the area under the curve.. On Fri, Nov 27, 2009 at 8:22 AM, Padmakumar Sivadasan <pmathru2@illinois.edu> wrote: > Dear All, > > I am analyzing the performance of companies indicated by a variable > v1. Variable v1 has a range 0-10 where higher values indicate poorer > performance. I am attempting to compare the performance of companies > for the country as a whole and to that at the local level > (Metropolitan Statistical Area). I am interested not only in the mean > value of v1 but also the variability of v1. One suggestion I got was > to compute the cumulative probabilities at the national and local > levels and then compare the area under the cumulative probability > distributions at the local level to that at the national level. > > I understand that I can use the -cumul- function in Stata to calculate > the cumulative probabilities but I couldn't find a method to calculate > the area under the cumulative probability curve. I have two questions > in this regard > (1) Is there a way in Stata to calculate the area under cumulative > probability curve? > (2) Could someone point me to reference that I can use to read up on > this method? * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Calculating area under a curve***From:*Padmakumar Sivadasan <pmathru2@illinois.edu>

**Re: st: Calculating area under a curve***From:*sjsamuels@gmail.com

**References**:**Re: st: Calculating area under a curve***From:*Padmakumar Sivadasan <pmathru2@illinois.edu>

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