hi, i want to take an x-y data set and find the deviation from another dataset. the master dataset is two identical y=1/x curves of different amplitude; also one only registers at periodic intervals and the second is multiplied by a noise signal. so part of the problem is going to be that the actual master dataset is inexactly defined as the noise signal itself [i used white noise between 1 and 0] is noise - i.e. i need to be able to say when something is just noise - in which case the match is prefect... make sense? can anyone start me off with this [i still need to find the perfect master dataset actually...]. thanks :) !!