Here are some of my favorite calc tools please feel free to ad yours!!!!
PPC ROI http://www.c3scripts.com/resources/p...alculator.html
ECPM http://eazyseo.com/seo-tools/cpm.php
Split Testing
A/B Test http://www.usereffect.com/split-test-calculator
A/B/C/D Ect http://tools.seobook.com/ppc-tools/c...plit-test.html
Has Graphs http://www.optimisationbeacon.com/to...st-calculator/
Good resources, I will check these out.
I often use http://splittester.com/index.php for A/B testing.
Brian Teasley also sells a spreadsheet for around $50 that has
three tabs to evaluate response rates, cost per response, and
sample-size significance:
http://www.teasley.net/free_stuff.htm
I plunked down the cash to test it out. It is proving useful for PPC
testing with lots of demographic variables.