20.18 Summary of the Model

summary(model)

## Call:
## rpart(formula=form, data=ds[tr, vars], model=TRUE)
##   n= 151934 
## 
##           CP nsplit rel error    xerror        xstd
## 1 0.15757483      0 1.0000000 1.0000000 0.004895087
## 2 0.03390348      1 0.8424252 0.8463348 0.004597363
## 3 0.01000000      3 0.7746182 0.7784973 0.004448507
## 
## Variable importance
##    humidity_3pm        temp_3pm        sunshine wind_gust_speed        max_temp 
##              78               5               4               3               3 
##        rainfall       cloud_3pm    humidity_9am  wind_speed_3pm  wind_speed_9am 
##               2               2               1               1               1 
## 
## Node number 1: 151934 observations,    complexity param=0.1575748
##   predicted class=No   expected loss=0.2154883  P(node) =1
##     class counts: 119194 32740
##    probabilities: 0.785 0.215 
##   left son=2 (126847 obs) right son=3 (25087 obs)
##   Primary splits:
##       humidity_3pm < 71.5    to the left,  improve=9016.219, (0 missing)
##       rainfall     < 0.55    to the left,  improve=5222.295, (0 missing)
##       rain_today   splits as  LR,          improve=5195.909, (0 missing)
##       cloud_3pm    < 6.5     to the left,  improve=3626.293, (0 missing)
##       sunshine     < 6.15    to the right, improve=2943.870, (0 missing)
##   Surrogate splits:
##       sunshine  < 0.55    to the right, agree=0.843, adj=0.051, (0 split)
##       temp_3pm  < 10.55   to the right, agree=0.843, adj=0.051, (0 split)
##       max_temp  < 10.65   to the right, agree=0.840, adj=0.029, (0 split)
##       rainfall  < 25.1    to the left,  agree=0.838, adj=0.020, (0 split)
##       cloud_3pm < 7.5     to the left,  agree=0.837, adj=0.011, (0 split)
## 
## Node number 2: 126847 observations
##   predicted class=No   expected loss=0.1388839  P(node) =0.8348823
##     class counts: 109230 17617
##    probabilities: 0.861 0.139 
## 
## Node number 3: 25087 observations,    complexity param=0.03390348
##   predicted class=Yes  expected loss=0.3971778  P(node) =0.1651177
....

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

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