Hi,

I have 2 sets of measurements of equal number. Each set is associated with a different set of markers, a top set and a bottom set.

I have the average position of each set of markers with the associated standard deviations.

Now I want to subtract the two averages to get an average distance, what do I do about the standard deviations?

Further information: there is no clear one to one correspondence between elements of one set to another, so calculating the difference between elements of one set to another is meaningless. This is due the manner that the experiment was set up.

Thanks for any help

B