Trying to estimate my average bet, so I ran a bunch of simulations assuming I used to optimal Kelly betting, and got this general formula from excel's trendline.
Average Bet (units) = 0.98 * Spread^0.36
Chart and Data here: https://accounts.google.com/ServiceLogin?service=wise&passive=1209600&continue=https://spreadsheets.google.com/ccc?key=0AtkX-haR_Tt-dF9YR3VWVVBSMmtqRGxPMGt6Sk1HTUE&hl=en&pref=2&followup=https://spreadsheets.google.com/ccc%
Note this is highly dependent on your penetration, rules, betting style, cover etc. etc. but it can be used as a starting point to guess what your average bet was with some degree of accuracy.
Edit: Data was for shoe games w/ Hi-Lo and KO.
Average Bet (units) = 0.98 * Spread^0.36
Chart and Data here: https://accounts.google.com/ServiceLogin?service=wise&passive=1209600&continue=https://spreadsheets.google.com/ccc?key=0AtkX-haR_Tt-dF9YR3VWVVBSMmtqRGxPMGt6Sk1HTUE&hl=en&pref=2&followup=https://spreadsheets.google.com/ccc%
Note this is highly dependent on your penetration, rules, betting style, cover etc. etc. but it can be used as a starting point to guess what your average bet was with some degree of accuracy.
Edit: Data was for shoe games w/ Hi-Lo and KO.