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Starting witht the 1st day of the index Close price of component stocks 1st day Current close / prior close = ratio Summation of all ratios / # of stocks in group * group prior close (ist day close of index should be 100). After 1st day Summation of all ratio / # of stocks in group * groups prior close High, Low, Close, Open Current high / current close = ratio Summation of all ratios / # of stocks in group * current close for the group |
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