If you use a spreadsheet, that would definitely be best for you. I think you can work out the formula you'll need from the script. One thing to watch out for is that I'm using natural logs, and I think most spreadsheets use log10. If you are using log10, just remove ln2log (or, equivalently, set it to 1). Let me know if there is anything else I can do to help (short of installing excel ).
5/28/15 at 12:48am