20.82 Conditional Regression Tree
We can also build a regression tree using (Hothorn et al. 2026).
##
## 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 <= 21.2
## | | [3] humidity_3pm <= 83
## | | | [4] humidity_3pm <= 67
## | | | | [5] pressure_3pm <= 1008.9
## | | | | | [6] humidity_3pm <= 51
## | | | | | | [7] sunshine <= 7.7
## | | | | | | | [8] wind_dir_3pm <= E: 4.899 (n=500, err=NA)
## | | | | | | | [9] wind_dir_3pm > E
## | | | | | | | | [10] humidity_3pm <= 25: 1.173 (n=250, err=NA)
## | | | | | | | | [11] humidity_3pm > 25
## | | | | | | | | | [12] wind_gust_speed <= 91
## | | | | | | | | | | [13] cloud_3pm <= 6
## | | | | | | | | | | | [14] pressure_3pm <= 994.6: 6.192 (n=24, err=1995.2)
## | | | | | | | | | | | [15] pressure_3pm > 994.6: 1.988 (n=541, err=NA)
## | | | | | | | | | | [16] cloud_3pm > 6: 3.375 (n=462, err=NA)
## | | | | | | | | | [17] wind_gust_speed > 91: 10.207 (n=30, err=13460.8)
## | | | | | | [18] sunshine > 7.7
## | | | | | | | [19] humidity_3pm <= 28
## | | | | | | | | [20] wind_gust_speed <= 56
## | | | | | | | | | [21] humidity_3pm <= 16
## | | | | | | | | | | [22] humidity_3pm <= 13
## | | | | | | | | | | | [23] wind_gust_speed <= 46: 0.023 (n=998, err=NA)
## | | | | | | | | | | | [24] wind_gust_speed > 46: 0.083 (n=524, err=NA)
## | | | | | | | | | | [25] humidity_3pm > 13: 0.224 (n=641, err=NA)
## | | | | | | | | | [26] humidity_3pm > 16
## | | | | | | | | | | [27] wind_gust_speed <= 37: 0.167 (n=610, err=NA)
## | | | | | | | | | | [28] wind_gust_speed > 37: 0.589 (n=1913, err=NA)
## | | | | | | | | [29] wind_gust_speed > 56
## | | | | | | | | | [30] humidity_3pm <= 15: 0.428 (n=745, err=NA)
## | | | | | | | | | [31] humidity_3pm > 15
## | | | | | | | | | | [32] wind_dir_3pm <= NE: 4.214 (n=127, err=NA)
## | | | | | | | | | | [33] wind_dir_3pm > NE
## | | | | | | | | | | | [34] sunshine <= 9
## | | | | | | | | | | | | [35] wind_speed_3pm <= 30
## | | | | | | | | | | | | | [36] wind_gust_speed <= 89: 1.816 (n=303, err=NA)
....References
Hothorn, Torsten, Kurt Hornik, Carolin Strobl, and Achim Zeileis. 2026. Party: A Laboratory for Recursive Partytioning. https://codeberg.org/thothorn/party.
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