Hello I am having problems with the function rateratio in epitools I getthe following error Error in ratetable(x, rev = rev) : All arguments to ratetable() must be the same length I checked that x is a 2x2 matrix. any idea? thanks Fabio Fabio Luciani Postdoctoral NHMRC research fellow Centre for Infection and Inflammation Research (CIIR), School of Medical Sciences, University of New South Wales, Sydney, NSW 2052 Australia Tel +61 2 93853838