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From |
sjsamuels@gmail.com |

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statalist@hsphsun2.harvard.edu |

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

Date |
Fri, 27 Nov 2009 14:03:33 -0500 |

Although areas under the cumulative probability curve F(t) are meaningless as far as I know, the total area under the survival curve S(t) = 1 - F(t) is equal to the mean. -Steve On Fri, Nov 27, 2009 at 12:15 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote: > 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/ > -- Steven Samuels sjsamuels@gmail.com 18 Cantine's Island Saugerties NY 12477 USA 845-246-0774 * * 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/

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

**st: RE: AW: Calculating area under a curve***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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