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Overall representation alone tells you little about progression. The leadership parity index — leadership representation divided by overall representation — shows whether a group advances at the same rate as everyone else. A value of 1.0 means parity; below 1.0 indicates a progression barrier.
Representation
Representation % = Group headcount / Total headcount x 100
Parity index
Parity index = Leadership representation % / Overall representation %
Because raw leadership percentages are dominated by overall representation. The index isolates the progression effect from the pipeline effect.
Hiring rate, promotion rate and attrition rate by group. Representation is a lagging outcome of those three flows.