Style Dispersion is derived directly from the Style Dispersion Metric as follows.
LOW: Style Dispersion Metric is less than or equal to 100
MEDIUM: Style Dispersion Metric is between 100 and 148
HIGH: Style Dispersion Metric is equal to or greater than 148
The breakpoints of 100 and 148 are static following a 20-60-20 rule. That is, roughly 60% of portfolios will be labeled as Medium, and 20% each as Low and High.