LNOB tree specifications
Our trees have 3 splitting criteria. The first is that we do not split further than a dept of 6 levels. This means we look at a maximum of 6 circumstances that impact access. The second is an absolute criterion, where the end nodes must have at least 49 observations, if it is less the tree will not split any further. The last is a relative criterion, where our end nodes must have no less than 9% of the weighted sample size. This splitting criterion does change depending on the analysis we are doing. For example, for our standard analysis we consider 9%, but for other analysis where we incorporate religion, ethnicity and language we change this percentage.