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From |
David Muller <davidmull@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: how to find the integral for a portion of a normal distribution. |

Date |
Tue, 4 May 2010 14:25:31 +1000 |

To expand upon Michael's suggestion, -display normal((1 - 2.05)/1.74)- will give you the proportion of responses <=1, and -display 1 - normal((1 - 2.05)/1.74)- will give you the proportion of responses >=1. Note that assuming this normal model for your response you would expect a little over 10% of your responses to be less than 0, which indicates a problem with your assumption if your response is strictly positive. David On Tue, May 4, 2010 at 2:01 PM, Hollis,Michael E <mhollis@mwdh2o.com> wrote: > ...you'll then be able to use the standard normal distribution with mean > zero and unit variance. > > Sent from my iPhone > > On May 3, 2010, at 8:49 PM, "Buzz Burhans" <buzzb3@earthlink.net> wrote: > >> Doesn't your suggestion fit only if the curve is standard normal?, i.e. >> mean >> 0, SD 1? >> >> Perhaps my use of integral is incorrect; what I want is the area under the >> curve of a normal distribution, mean 2.05, sd 1.75 for the portion >= >> threshold =1, and then the portion < 1 >> >> Buzz >> >> >> statalist@hsphsun2.harvard.edu] On Behalf Of Hollis,Michael E >> Sent: Monday, May 03, 2010 9:36 PM >> To: statalist@hsphsun2.harvard.edu >> Subject: Re: st: how to find the integral for a portion of a normal >> distribution. >> >> I may be missing something here, but can't you simply use the normal >> distribution with mean=proportion z >= some threshold, q=1-p and >> variance p(1-p)/n? No integration involved. >> >> As I said, I might be missing something! >> >> Sent from my iPhone >> >> .ucla.edu/stat/stata/ >> >> * >> * 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/ > > * > * 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/ > * * 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: how to find the integral for a portion of a normal distribution.***From:*"Buzz Burhans" <buzzb3@earthlink.net>

**RE: st: how to find the integral for a portion of a normal distribution.***From:*"Buzz Burhans" <buzzb3@earthlink.net>

**References**:**RE: st: how to find the integral for a portion of a normal distribution.***From:*"Buzz Burhans" <buzzb3@earthlink.net>

**Re: st: how to find the integral for a portion of a normal distribution.***From:*"Hollis,Michael E" <mhollis@mwdh2o.com>

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