20.18 Summary of the Model

summary(model)

## Call:
## rpart(formula=form, data=ds[tr, vars], model=TRUE)
##   n= 158807 
## 
##           CP nsplit rel error    xerror        xstd
## 1 0.15356046      0 1.0000000 1.0000000 0.004790312
## 2 0.03491739      1 0.8464395 0.8461179 0.004498424
## 3 0.01000000      3 0.7766048 0.7792660 0.004354886
## 
## Variable importance
## humidity_3pm     rainfall     temp_3pm     sunshine   rain_today     max_temp 
##           78            4            4            4            3            2 
## humidity_9am    cloud_3pm 
##            2            1 
## 
## Node number 1: 158807 observations,    complexity param=0.1535605
##   predicted class=No   expected loss=0.2153243  P(node) =1
##     class counts: 124612 34195
##    probabilities: 0.785 0.215 
##   left son=2 (132754 obs) right son=3 (26053 obs)
##   Primary splits:
##       humidity_3pm < 71.5    to the left,  improve=9260.796, (0 missing)
##       rainfall     < 0.75    to the left,  improve=5492.700, (0 missing)
##       rain_today   splits as  LR,          improve=5467.632, (0 missing)
##       cloud_3pm    < 6.5     to the left,  improve=3904.979, (0 missing)
##       humidity_9am < 74.5    to the left,  improve=3015.951, (0 missing)
##   Surrogate splits:
##       sunshine  < 0.85    to the right, agree=0.844, adj=0.051, (0 split)
##       temp_3pm  < 10.75   to the right, agree=0.844, adj=0.048, (0 split)
##       max_temp  < 10.95   to the right, agree=0.840, adj=0.026, (0 split)
##       rainfall  < 30.3    to the left,  agree=0.839, adj=0.018, (0 split)
##       cloud_3pm < 7.5     to the left,  agree=0.837, adj=0.005, (0 split)
## 
## Node number 2: 132754 observations
##   predicted class=No   expected loss=0.1396794  P(node) =0.8359455
##     class counts: 114211 18543
##    probabilities: 0.860 0.140 
## 
## Node number 3: 26053 observations,    complexity param=0.03491739
##   predicted class=Yes  expected loss=0.3992247  P(node) =0.1640545
....

In the following pages we dissect the various components of this summary.

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