Ok, I have attempted to run the calculation for a recent site (http://bookfairs.scholastic.co.uk)…

80 total dev time
10 ie6 dev time
13399 total audience based on 30 days usage
5331 ie6 audience

p=24.859

What I don’t know from the article is — what does it mean. ~40% of our users are on IE6 (mainly teachers in schools)? Does that number suggest we should be using the script or not?

Thanks for any help,

Peter

p.s. prompted by a Malarkey tweet…