...though maybe a time saver for those in a crunch, albeit an expensive one. 

Please refer to this thread.  I have modified my equation slightly form this earlier post, but the essence is to do this all on SMS or SST and export - take some time but I get to keep my data.   Email me if you want my updated fitted equations. 

http://talk.newagtalk.com/forums/thread-view.asp?tid=455088&mid=3697440#M3697440

$100 riding on anyone able to statistically prove this to be inferior profit maximizing strategy.