20.17 Summary of the Model
## Call:
## rpart(formula=form, data=ds[tr, vars], model=TRUE)
## n= 192787
##
## CP nsplit rel error xerror xstd
## 1 0.15425119 0 1.0000000 1.0000000 0.004367803
## 2 0.03588761 1 0.8457488 0.8428856 0.004094783
## 3 0.03358245 2 0.8098612 0.8161943 0.004043425
## 4 0.01000000 3 0.7762788 0.7768368 0.003964783
##
## Variable importance
## humidity_3pm temp_3pm sunshine wind_gust_speed max_temp
## 80 4 4 3 3
## humidity_9am rainfall wind_speed_3pm cloud_3pm wind_speed_9am
## 1 1 1 1 1
##
## Node number 1: 192787 observations, complexity param=0.1542512
## predicted class=No expected loss=0.2137696 P(node) =1
## class counts: 151575 41212
## probabilities: 0.786 0.214
## left son=2 (160906 obs) right son=3 (31881 obs)
## Primary splits:
## humidity_3pm < 71.5 to the left, improve=11378.440, (0 missing)
## rainfall < 0.75 to the left, improve= 6433.099, (0 missing)
## rain_today splits as LR, improve= 6389.914, (0 missing)
## cloud_3pm < 6.5 to the left, improve= 4582.327, (0 missing)
## humidity_9am < 78.5 to the left, improve= 3591.829, (0 missing)
## Surrogate splits:
## temp_3pm < 10.55 to the right, agree=0.842, adj=0.047, (0 split)
## sunshine < 0.85 to the right, agree=0.842, adj=0.044, (0 split)
## max_temp < 11.05 to the right, agree=0.839, adj=0.028, (0 split)
## rainfall < 26.75 to the left, agree=0.838, adj=0.018, (0 split)
## temp_9am < -0.75 to the right, agree=0.835, adj=0.005, (0 split)
##
## Node number 2: 160906 observations
## predicted class=No expected loss=0.1373038 P(node) =0.834631
## class counts: 138813 22093
## probabilities: 0.863 0.137
##
## Node number 3: 31881 observations, complexity param=0.03588761
....In the following pages we dissect the various components of this summary.
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