A Flash demo for this http://noppa5.pc.helsinki.fi/koe/flash/distrib/mixture7.html
Juha On Mon, 03 May 2004 10:36:35 -0700, Peter Flom wrote: > A mixture of normals can have just about any shape (see the book Finite > Mixture Models by McLachlan and Peel, which has, near the beginning, a > small bestiary of distributions generated with mixtures of normals.); it > need not be normal, or even remotely close to normal, if you allow the > means and variances to vary. > > It could be unimodal, even if the means differ. One way this could > happen is if the means are relatively close, compared to the variances. > > > HTH > > Peter > > Peter L. Flom, PhD > Assistant Director, Statistics and Data Analysis Core > Center for Drug Use and HIV Research > National Development and Research Institutes > 71 W. 23rd St > www.peterflom.com > New York, NY 10010 > (212) 845-4485 (voice) > (917) 438-0894 (fax) > > >>>> [EMAIL PROTECTED] 05/03/04 1:29 PM >>> > Although apparently "a mixture of two normals, differing in means, can > still > be unimodal" (orig. Everitt, 1981 "Bimodality and the nature of > depression") -- which I don't quite 'see' yet. > > ----- Original Message ----- > From: "rd3d" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Monday, May 03, 2004 10:41 AM > Subject: [edstat] Mixture of normal distributions > > >> I would like to know if the mixture of normal distributions is also >> considered a normal distribution (with mean and variance of the > mixture as >> parameters). >> If one looks at the graph of the mixture, it is not really > bell-shaped, so >> I am wondering if it can still be normally distributed. >> >> . >> . >> ================================================================= >> Instructions for joining and leaving this list, remarks about the >> problem of INAPPROPRIATE MESSAGES, and archives are available at: >> . http://jse.stat.ncsu.edu/ . >> ================================================================= >> > > . > . > ================================================================= > Instructions for joining and leaving this list, remarks about the > problem of INAPPROPRIATE MESSAGES, and archives are available at: > . http://jse.stat.ncsu.edu/ . > ================================================================= > > . > . > ================================================================= > Instructions for joining and leaving this list, remarks about the > problem of INAPPROPRIATE MESSAGES, and archives are available at: > . http://jse.stat.ncsu.edu/ . > ================================================================= . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
