Bill,
I've had a look at your method & I think it is good. the only part I'm not sure about is the length of the string of numbers (8 on your spreadsheet). This constraint could cause you to miss certain trends, e.g. if the price/RSI jumps quickly over a few minutes & then decreases just as quickly.
I was thinking about a more simplistic approach - i.e. just graph change in price divided by change in RSI for 1min intervals. The resulting chart will be messy but this could be smoothed out using an appropriate moving average - what do you think?
Cheers
A&L
p.s. thanks for the link - hopefully I can use one of the add-ins to read in an array of price/RSI info.