有一个题 indexing strategy 是选optimization还是stratified?
the objective is to minimize transaction cost and tracking error in the same time。
optimization minimizes tracking error but has large transaction cost。
stratified has moderate t-cost and tracking error。
我原来选stratefied后来改称optimization,现在想想还是stratify对。
Actually, t-cost and tracking error is a trade-off and cannot be minimized simultaneously。
one possible method is to use an objective function as a weighted sum of t-cost and tracking error。