There is no volume in index! The weighted average is on the basis of the weightage ratio given to the scrips in the index (constituent securities in the index). Means, the index is calculated on the closing prices (not the last traded prices) of the index securities according to their weightage in the index.
Closing price of the securities is the last 30 minutes VWAP.
But the closing price of index is NOT the last 30 minutes average.
That is what I had given in -
There is no volume in index! The weighted average is on the basis of the weightage ratio given to the scrips in the index (constituent securities in the index). Means, the index is calculated on the closing prices (not the last traded prices) of the index securities according to their weightage in the index.