Fig. 5: SHAP value summary plots for all six clusters.

The SHAP value summary plot ranks features based on their contribution to cluster characterisation, with the most important features at the top. Each feature is represented by a horizontal bar where the colour of the bar indicates the value of the variable or feature, with blue indicating a low value and red indicating a high value64. The direction of the SHAP value denotes how effectively a feature value can characterise the cluster. A positive (negative) SHAP value denotes a feature that is more likely (less likely) to characterise the cluster.