Sorry for posting the same query again. It seems our server was down for the last few days and hence all the responses bounced back. Regards, Alpana Hi, I have been trying to solve a particular problem for quite some time now. I have a few parameters relating to a hurricane track, like central pressure, track duration, track length, bearing, translational speed, etc. With this set of parameters, I want to develop a relationship between central pressure (CP) and the other parameters, keeping CP as a dependent variable and the rest as independent variable. Eventually I want to be able to predict CP using this relationship. The parameters themselves are not correlated but are not independent either. I have tried fitting various linear and nonlinear models without much success. It would be a great help to me, if you could suggest a solution to this problem. Thanks in advance Regards, Alpana