Thank you Herman and Glen for your reply's...they have helped me a lot. have read something on log-concave distributions and now believe that the sum of log-concanve distributions will also have a log-concave distribution (and therefore is unimodal). However, I am wondering why the distribution of the sum of logistically distributed variables is clearly symmetric. Is the distribution of a sum of symmetrically distributed variables always symmetric? I will probably use the Chebyshev type inequality (is this the Camp-Weidell inequality?) to compute a one-tailed probability bound, so I think the information regarding symmetry is important.
Thank you again for your help, and hopefully you can help me out here as well! Regards, Maarten . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
