a single coefficient for each variable regardless of what other variables are u2018 switched on the predicted value table below shows the values for all eight combinations to obtain the predicted values of d2 from this regression simply subtract p d1 from 1 for example the predicted value of d2 for the combination of events a1b1c1 is 1 u2212 0 8 0 2 predicted values regression of a b c on d events p d1 predicted p d1 actual cases p d1 u00d7 cases 100 a1b1c1 0 79 0 8 39 0 31 a1b1c2 0 76 0 8 10 0 08 a1 u02dc b1c1 0 65 0 7 13 0 08 a1 u02dc b1c2 0 62 0 5 8 0 05 a2b1c1 0 52 0 5 18 0 09 a2b1c2 0 49 0 5 2 0 01 a2 u02dc b1c1 0 38 0 4 3 0 01 a2 u02dc b1c2 0 35 0 4 7 0 02 note that if you sum p d1 u00b7 cases 100 you get the overall contribution of the tree 0 66 by selecting subsets of the data we can also obtain the contributions for any point along a path for example we can estimate the situation shown by the situation map by estimating the probability of d1 given that a and u02dc b have occurred dependent variable is d cases selected according to aand u02dc b 100 total cases of which 79 are missing r squared 3 7 r squared adjusted u2212 1 4 s 0 5010 with 21 u2212 2 19.