14.7 Predict Probability

20200607 To extract the probability of it raining tomorrow from the prediction made by the model. For a rpart model we can obtain the probability of it raining tomorrow using stats::predict() with type="prob".

ds[tr, vars] %>% predict(model, newdata=., type="prob") %>% '['(,2) -> pr_tr
ds[tu, vars] %>% predict(model, newdata=., type="prob") %>% '['(,2) -> pr_tu
ds[te, vars] %>% predict(model, newdata=., type="prob") %>% '['(,2) -> pr_te

head(pr_tr)

##         1         2         3         4         5         6 
## 0.1423613 0.1423613 0.6096989 0.6096989 0.1423613 0.1423613

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