Vistimo.com, the tool I built and use when I run estimates for my clients, uses log-normals and monte-carlo simulation to conquer this exact problem. Really ex

Vistimo.com, the tool I built and use when I run estimates for my clients, uses log-normals and monte-carlo simulation to conquer this exact problem. Really exciting to see other people beginning to recognize and use the same statistical tools -- they've served me really well.