Subject: Re: SP 600 Deletions Performance
For a mid cap index, you'd probably want to track four categories: those that left the index because they were promoted upwards, those that left by being demoted downwards, those that arrived from above by demotion, and those that arrived from below by promotion.

Same for the small cap S&P600 index. You want to track separately the stocks that have been promoted into the mid-cap S&P400 versus those that have been dropped into oblivion.

Elan