The non-central t is symmetric. Paul R. Swank, Ph.D. Professor, Developmental Pediatrics Medical School UT Health Science Center at Houston
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of David Wnsemius Sent: Monday, November 18, 2002 10:46 PM To: [EMAIL PROTECTED] Subject: Re: Two questions [EMAIL PROTECTED] (Alan McLean) wrote in news:9391A1A0-FAE2- [EMAIL PROTECTED]: > This argument relies on the symmetry of the normal and t distributions > - what happens with a confidence interval for a variance? > Don't you need to consider the non-central T (which is not symmetric)? The CI for the variance is determined by the appropriate percentiles of the (non-symmetric) chi. David Winsemius . . ================================================================= 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/ . =================================================================
