Data Science Desktop Survival Guide by Graham Williams
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Conditional Regression Tree

We can also build a regression tree using party.

model <- ctree(formula=form, data=ds[tr, vars])

model

## 
## Model formula:
## risk_mm ~ rain_today + temp_3pm + temp_9am + cloud_3pm + cloud_9am + 
##     pressure_3pm + pressure_9am + humidity_3pm + humidity_9am + 
##     wind_speed_3pm + wind_speed_9am + wind_dir_3pm + wind_dir_9am + 
##     wind_gust_speed + wind_gust_dir + sunshine + evaporation + 
##     rainfall + max_temp + min_temp
## 
## Fitted party:
## [1] root
## |   [2] rainfall <= 24
## |   |   [3] humidity_3pm <= 81
## |   |   |   [4] humidity_3pm <= 66
## |   |   |   |   [5] wind_gust_speed <= 52
## |   |   |   |   |   [6] humidity_3pm <= 50
## |   |   |   |   |   |   [7] sunshine <= 7.5
## |   |   |   |   |   |   |   [8] pressure_3pm <= 1014.5
## |   |   |   |   |   |   |   |   [9] wind_dir_9am <= NE
## |   |   |   |   |   |   |   |   |   [10] humidity_3pm <= 33: 1.722 (n=...
## |   |   |   |   |   |   |   |   |   [11] humidity_3pm > 33
## |   |   |   |   |   |   |   |   |   |   [12] cloud_3pm <= 4
## |   |   |   |   |   |   |   |   |   |   |   [13] sunshine <= 5.7: 3.450 ...
## |   |   |   |   |   |   |   |   |   |   |   [14] sunshine > 5.7: 0.331 (...
## |   |   |   |   |   |   |   |   |   |   [15] cloud_3pm > 4: 4.595 (n=3...
## |   |   |   |   |   |   |   |   [16] wind_dir_9am > NE
## |   |   |   |   |   |   |   |   |   [17] pressure_3pm <= 1005.1: 3.847 (...
## |   |   |   |   |   |   |   |   |   [18] pressure_3pm > 1005.1: 1.345 (n...
## |   |   |   |   |   |   |   [19] pressure_3pm > 1014.5
## |   |   |   |   |   |   |   |   [20] pressure_3pm <= 1023.5
## |   |   |   |   |   |   |   |   |   [21] cloud_3pm <= 5: 0.423 (n=855,...
## |   |   |   |   |   |   |   |   |   [22] cloud_3pm > 5: 0.826 (n=1029,...
## |   |   |   |   |   |   |   |   [23] pressure_3pm > 1023.5
## |   |   |   |   |   |   |   |   |   [24] rainfall <= 9: 0.099 (n=506, ...
## |   |   |   |   |   |   |   |   |   [25] rainfall > 9: 1.000 (n=12, er...
## |   |   |   |   |   |   [26] sunshine > 7.5
## |   |   |   |   |   |   |   [27] pressure_3pm <= 1008.5
## |   |   |   |   |   |   |   |   [28] humidity_3pm <= 31
## |   |   |   |   |   |   |   |   |   [29] humidity_3pm <= 23
## |   |   |   |   |   |   |   |   |   |   [30] humidity_3pm <= 13: 0.046 (...
## |   |   |   |   |   |   |   |   |   |   [31] humidity_3pm > 13: 0.257 (n...
## |   |   |   |   |   |   |   |   |   [32] humidity_3pm > 23: 0.705 (n=7...
## |   |   |   |   |   |   |   |   [33] humidity_3pm > 31
## |   |   |   |   |   |   |   |   |   [34] cloud_3pm <= 3
## |   |   |   |   |   |   |   |   |   |   [35] sunshine <= 9.9: 1.001 (n =...
## |   |   |   |   |   |   |   |   |   |   [36] sunshine > 9.9: 0.250 (n=...
....