Hello, I am trying to input the following formula into R for parameter estimation. I don't quite have the just of formula syntax. I understand simple basic regression (y ~ x), but how do I do the ff: y = ( b0*x )/(x + b1), where b0 and b1 are parameters that need to be solved. Any help/suggestions for a newbie would be much appreciated. thanks ./w Wayne Delport Molecular Ecology and Evolution Programme Department of Genetics University of Pretoria Pretoria 0002 South Africa Percy FitzPatrick Institute of African Ornithology University of Cape Town Rondebosch Cape Town 7701 South Africa "640K ought to be enough for anybody" Bill Gates, 1981 "I love deadlines, I love the whooshing noise they make as they go by." Douglas Adams