Impact value is simply win rate for the data point being examined divided by win rate for the total sample.
Example - the following cut and paste from the Data Window shows the month of Nov, 2016 with the data broken out by odds rank:
query start: 12/1/2016 3:41:56 PM query end: 12/1/2016 3:42:08 PM elapsed time: 12 seconds ` Data Window Settings: Connected to: C:\JCapper\exe\JCapper2.mdb 999 Divisor Odds Cap: None SQL UDM Plays Report: Hide ` SQL: SELECT * FROM STARTERHISTORY WHERE [DATE] >= #11-01-2016# AND [DATE] <= #11-30-2016# ORDER BY [DATE], TRACK, RACE ` ` Data Summary Win Place Show ----------------------------------------------------- Mutuel Totals 36247.40 37021.50 36806.80 Bet -48712.00 -48712.00 -48712.00 ----------------------------------------------------- P/L -12464.60 -11690.50 -11905.20 ` Wins 2965 5910 8722 Plays 24356 24356 24356 PCT .1217 .2427 .3581 ` ROI 0.7441 0.7600 0.7556 Avg Mut 12.23 6.26 4.22 ` ` By: Odds Rank ' Rank P/L Bet Roi Wins Plays Pct Impact ----------------------------------------------------------------------- 1 -781.70 6060.00 0.8710 1148 3030 .3789 3.1123 2 -1070.40 5842.00 0.8168 615 2921 .2105 1.7295 3 -1193.40 5782.00 0.7936 414 2891 .1432 1.1763 4 -1380.30 5786.00 0.7614 287 2893 .0992 0.8149 5 -1627.70 5764.00 0.7176 196 2882 .0680 0.5587 6 -1841.20 5522.00 0.6666 124 2761 .0449 0.3689 7 -1454.50 4748.00 0.6937 87 2374 .0366 0.3010 8 -752.10 3672.00 0.7952 52 1836 .0283 0.2327 9 -498.30 2574.00 0.8064 30 1287 .0233 0.1915 10 -703.60 1618.00 0.5651 10 809 .0124 0.1015 11 -720.80 790.00 0.0876 1 395 .0025 0.0208 12 -328.60 442.00 0.2566 1 221 .0045 0.0372 13 -72.00 72.00 0.0000 0 36 .0000 0.0000 14 -40.00 40.00 0.0000 0 20 .0000 0.0000
Win rate for post time favorites is 0.378878.
Win rate for the total sample is 0.12173591.
Impact value for post time favorites is 3.1123
or:
IV = 0.378878 / 0.12173591
-jp
.
~Edited by: jeff on: 12/1/2016 at: 5:55:02 PM~
|