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

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

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

Date |
Fri, 27 Nov 2009 17:15:13 -0000 |

Just to point out that -cumul- gives you the (cumulated) area under the density function. That's what a distribution function is. I don't see why you would want to integrate again. Nick n.j.cox@durham.ac.uk Martin Weiss Would the -qqplot- recently advertised by NJC not be a good alternative? See http://www.stata.com/statalist/archive/2009-11/msg01157.html Padmakumar Sivadasan 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: RE: AW: Calculating area under a curve***From:*sjsamuels@gmail.com

**st: RE: RE: AW: Calculating area under a curve***From:*philippe van kerm <philippe.vankerm@ceps.lu>

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

**st: AW: Calculating area under a curve***From:*"Martin Weiss" <martin.weiss1@gmx.de>

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