20.18 Summary of the Model
summary(model)## Call:
## rpart(formula = form, data = ds[tr, vars], model = TRUE)
## n= 123722
##
## CP nsplit rel error xerror xstd
## 1 0.14525806 0 1.0000000 1.0000000 0.005511437
## 2 0.03497808 1 0.8547419 0.8543189 0.005191983
## 3 0.01000000 3 0.7847858 0.7890547 0.005031264
##
## Variable importance
## humidity_3pm sunshine temp_3pm wind_gust_speed max_temp
## 78 4 4 3 3
## cloud_3pm humidity_9am wind_speed_3pm wind_speed_9am rainfall
## 2 1 1 1 1
##
## Node number 1: 123722 observations, complexity param=0.1452581
## predicted class=No expected loss=0.2101647 P(node) =1
## class counts: 97720 26002
## probabilities: 0.790 0.210
## left son=2 (104365 obs) right son=3 (19357 obs)
## Primary splits:
## humidity_3pm < 71.5 to the left, improve=6887.670, (0 missing)
## rainfall < 0.55 to the left, improve=4079.306, (0 missing)
## rain_today splits as LR, improve=4023.390, (0 missing)
## cloud_3pm < 6.5 to the left, improve=2778.256, (0 missing)
## sunshine < 6.05 to the right, improve=2630.088, (0 missing)
## Surrogate splits:
## sunshine < 0.45 to the right, agree=0.852, adj=0.053, (0 split)
## temp_3pm < 10.55 to the right, agree=0.851, adj=0.050, (0 split)
## max_temp < 10.55 to the right, agree=0.848, adj=0.029, (0 split)
## cloud_3pm < 7.5 to the left, agree=0.846, adj=0.018, (0 split)
## rainfall < 30.3 to the left, agree=0.846, adj=0.016, (0 split)
##
## Node number 2: 104365 observations
## predicted class=No expected loss=0.1383127 P(node) =0.8435444
## class counts: 89930 14435
## probabilities: 0.862 0.138
##
## Node number 3: 19357 observations, complexity param=0.03497808
## predicted class=Yes expected loss=0.4024384 P(node) =0.1564556
## class counts: 7790 11567
## probabilities: 0.402 0.598
## left son=6 (10680 obs) right son=7 (8677 obs)
## Primary splits:
## humidity_3pm < 82.5 to the left, improve=933.6523, (0 missing)
## rainfall < 2.1 to the left, improve=636.3515, (0 missing)
## rain_today splits as LR, improve=620.9481, (0 missing)
## wind_gust_speed < 42 to the left, improve=441.6061, (0 missing)
## pressure_3pm < 1011.65 to the right, improve=391.1549, (0 missing)
## Surrogate splits:
## humidity_9am < 90.5 to the left, agree=0.615, adj=0.141, (0 split)
## cloud_3pm < 7.5 to the left, agree=0.610, adj=0.131, (0 split)
## temp_3pm < 11.95 to the right, agree=0.596, adj=0.099, (0 split)
## sunshine < 1.45 to the right, agree=0.590, adj=0.084, (0 split)
## max_temp < 11.85 to the right, agree=0.584, adj=0.072, (0 split)
##
## Node number 6: 10680 observations, complexity param=0.03497808
## predicted class=No expected loss=0.4575843 P(node) =0.08632256
## class counts: 5793 4887
## probabilities: 0.542 0.458
## left son=12 (6441 obs) right son=13 (4239 obs)
## Primary splits:
## wind_gust_speed < 42 to the left, improve=316.7443, (0 missing)
## rainfall < 2.7 to the left, improve=307.9253, (0 missing)
## rain_today splits as LR, improve=292.8988, (0 missing)
## pressure_9am < 1015.55 to the right, improve=257.6968, (0 missing)
## pressure_3pm < 1012.65 to the right, improve=243.6277, (0 missing)
## Surrogate splits:
## wind_speed_3pm < 23 to the left, agree=0.757, adj=0.389, (0 split)
## wind_speed_9am < 19.5 to the left, agree=0.749, adj=0.368, (0 split)
## pressure_9am < 1010.95 to the right, agree=0.644, adj=0.104, (0 split)
## pressure_3pm < 1011.45 to the right, agree=0.630, adj=0.068, (0 split)
## humidity_9am < 65.5 to the right, agree=0.618, adj=0.036, (0 split)
##
## Node number 7: 8677 observations
## predicted class=Yes expected loss=0.2301487 P(node) =0.07013304
## class counts: 1997 6680
## probabilities: 0.230 0.770
##
## Node number 12: 6441 observations
## predicted class=No expected loss=0.3587952 P(node) =0.05206026
## class counts: 4130 2311
## probabilities: 0.641 0.359
##
## Node number 13: 4239 observations
## predicted class=Yes expected loss=0.3923095 P(node) =0.0342623
## class counts: 1663 2576
## probabilities: 0.392 0.608In the following pages we dissect the various components of this summary.
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