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From |
"Edgar Munoz" <munozedg@hotmail.com> |

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

Subject |
st: RE: RE: probability question |

Date |
Wed, 28 Oct 2009 11:45:03 -0500 |

I like this approach using tabi as a calculator for this. r(p_exact) is P(n11 >= 3), the p-value in the Fisher's exact test if we calculate P(n11 >= 4), we can obtain P(n11 = 3) by difference . tabi 4 0 \ 3 113, exact | col row | 1 2 | Total -----------+----------------------+---------- 1 | 4 0 | 4 2 | 3 113 | 116 -----------+----------------------+---------- Total | 7 113 | 120 Fisher's exact = 0.000 1-sided Fisher's exact = 0.000 . return list scalars: r(p1_exact) = 4.26072210718e-06 r(p_exact) = 4.26072210718e-06 r(c) = 2 r(r) = 2 r(N) = 120 | p3exact p3plus p4plus | |--------------------------------| 1. | .0004815 .0004857 4.26e-06 | -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Visintainer PhD, Paul Sent: Wednesday, October 28, 2009 7:49 AM To: 'statalist@hsphsun2.harvard.edu' Subject: st: RE: probability question I'm probably thinking of this too simplistically, but wouldn't this just be a Fisher's exact test? . tabi 3 1 \ 4 112, exact /* where col = rain and row = hat */ | col row | 1 2 | Total -----------+----------------------+---------- 1 | 3 1 | 4 2 | 4 112 | 116 -----------+----------------------+---------- Total | 7 113 | 120 Fisher's exact = 0.000 1-sided Fisher's exact = 0.000 . return list scalars: r(p1_exact) = .0004857223202188 r(p_exact) = .0004857223202188 r(c) = 2 r(r) = 2 r(N) = 120 ___________________________________ Paul F. Visintainer, PhD -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Richard Goldstein Sent: Wednesday, October 28, 2009 8:38 AM To: statalist Subject: st: probability question it's been a long time since I thought about questions like this, but, as a lead-in to a study, a client has asked the following question which he thinks he understands and says is related to where he wants to go: during a consecutive period of 120 days, if it rains on 7 days and my client wears a hat on 4 days (these are independent of any knowledge of the weather), what is the probability that it will rain on 3 of the days on which he is wearing a hat? my client swears that this is not a homework problem for him or his wife or one of their kids! Rich * * 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/ ---------------------------------------------------------------------- CONFIDENTIALITY NOTICE: This email communication and any attachments may contain confidential and privileged information for the use of the designated recipients named above. If you are not the intended recipient, you are hereby notified that you have received this communication in error and that any review, disclosure, dissemination, distribution or copying of it or its contents is prohibited. If you have received this communication in error, please reply to the sender immediately or by telephone at (413) 794-0000 and destroy all copies of this communication and any attachments. For further information regarding Baystate Health's privacy policy, please visit our Internet web site at http://www.baystatehealth.com. * * 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: RE: RE: probability question***From:*Richard Goldstein <richgold@ix.netcom.com>

**References**:**st: probability question***From:*Richard Goldstein <richgold@ix.netcom.com>

**st: RE: probability question***From:*"Visintainer PhD, Paul" <Paul.Visintainer@baystatehealth.org>

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