SWTOR formula list

[shinyhalo]

So if the first to-hit roll is "Accuracy vs Defense" then what does that formula look like?
Is it a fixed to-hit number added to accuracy and if it's greater than defense then it's a hit? If so, what is the fixed number?
Or is it a variable or a range of numbers?

I feel like I hit in pve 100% of the time in beta, but I was always within a couple levels of my targets. Pvp was too fast paced for me to notice if I was hitting.