Is there any signification in the height of the split in a tree when it's plotted with R ?
How can we interpret the fact than the blue split is bigger than the red one?
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It's quite murky but the documentation has the answer.
Applies only when uniform=FALSE. Default .3. The minimum height between levels is clamped at minbranch times the mean interlevel distance. Needed because sometimes a split gives little or no improvement in deviance, and an interlevel distance strictly proportional to the improvement would leave no room for the label.
Note : these heights can all be adjust and changed - it's just defaulting to this.