Comment on ``Dynamical Foundations of Nonextensive Statistical   Mechanics"
  In a recent letter, Christian Beck described a theoretical link between a family of stochastic differential equations and the probability density functions (PDF) derived from the formalism of nonextensive statistical mechanics. He applied the theory to explain experimentally measured PDFs from fully developed fluid turbulence. Here we present new experimental results with better statistics which show that the linear model propose by C. Beck does not capture the experimental observations. 
Alice M. Crawford, Nicolas Mordant, Andy M. Reynolds and Eberhard   Bodenschatz