20.18 Summary of the 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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