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Measure fragmentation of a single index?

We are measuring the impact of different defrag approaches that we do one index at a time. How do we query to see fragmentation of a single index, by index name (or table + index). This is on SQL ...
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Including INSERT, UPDATE, DELETE when performing vertical framentation

I had a task to perform vertical fragmentation that involves developing Attribute Usage Matrix (AUM) and Attribute Affinity Matrix (AAM) I do know how to construct them, but I am confused over one ...