Non-Gaussian error distribution of Hubble constant measurements

We construct the error distribution of Hubble constant (H-0) measurements from Huchra's compilation of 461 measurements of H-0 and the WMAP experiment central value H-0 = 71 km s(-1) Mpc(-1). This error distribution is non-Gaussian, with significantly larger probability in the tails of the distribution than predicted by a Gaussian distribution. The 95.4% confidence limits are 7.0 sigma in terms of the quoted errors. It is remarkably well described by either a widened n = 2 Student t distribution or a widened double exponential distribution. These conclusions are unchanged if we use instead the central value H-0 = 67 km s(-1) Mpc(-1) found from a median statistics analysis of a major subset of H-0 measurements used here.