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I'm trying to write a small software to calculate a laspeyres, as an exercise, but not having a finance background it's a bit hard to understand some stuff. I'm having problems calculating this divisor:

http://cubeupload.com/im/muaddib/divisor.png

The difference between the closing market capitalization of the index and the adjusted closing market capitalization of the index:

For companies with corporate actions effective at time (t+1), the free float market capitalization is calculated with adjusted closing prices, the new number of shares at time (t+1) and the free float factor at time (t+1) minus the free float market capitalization calculated with closing prices, number of shares at time (t) and free float factor at time (t).

DeltaMC is the thing that is giving me trouble. What is the adjusted closing market capitalization? How do I calculate this parameter?

My guess is that it is non-zero when the numbers of circulating shares changes, so is it the difference between the market capitalization before and after the share emission?

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