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China Securities Index Co., Ltd. (CSIF) has recently announced revisions to the compilation methods for three indices, with particular focus on the CSI AI Industry Index. The notable changes encompass: the introduction of a new criterion to exclude the bottom 20% of securities based on standardized unexpected earnings; the adjustment of the comprehensive factor score calculation for sample selection and weighting to "average daily total market value over the past year multiplied by income proportion score and industry-neutral net profit growth score"; and the alteration of the timing for regular sample adjustments to the trading day immediately following the second Friday of March, June, September, and December each year. All other aspects of the indices remain unchanged, and the revised scheme will come into effect on July 29.
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