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因子排名选股策略的向量化回测与蒙特卡洛稳健性检验:随机基准、N+M 排名扰动、调仓相位,并与 BigTrader 对账。Vectorised backtest and Monte Carlo robustness test for top-N factor-ranking stock strategies, reconciled against BigTrader. 适用于“按排名取前 N 只、等权、定期调仓”的策略;不适用于择时、多空、日内策略。