为什么B和C不对？

NO.PZ202206140600000202 问题如下 Baseon the client’s investment mante, the most appropriate appraismeasure for McNeil to use is the: A.Sortino ratio. B.Treynor ratio. C.information ratio. SolutionA is correct. Given ththe funmante requirement is for a short-term return in excess of the risk-free rate, the Sortino ratio is a more appropriate measure because it penalizes returns below a specific return—in this case, 1.5% above the risk-free rate. B is incorrect. The Treynor ratio penalizes returns below the risk-free rate. It will not measure the funs ability to meet the requirement of a short-term return in excess of the risk-free rate.C is incorrect. The information ratio evaluates the portfolio return relative to a benchmark. It will not measure the funs ability to meet the requirement of a short-term return in excess of the risk-free rate. “从Treynor ratio的公式可以看出，Treynor ratio的benchmark，并不是1.5% + risk free rate，而是一个inx。”Treynor ratio的分子不是减去的无风险收益率吗？题目和课件都是减risk free rate啊

NO.PZ202206140600000202问题如下 Baseon the client’s investment mante, the most appropriate appraismeasure for McNeil to use is the:A.Sortino ratio.B.Treynor ratio.C.information ratio.SolutionA is correct. Given ththe funmante requirement is for a short-term return in excess of the risk-free rate, the Sortino ratio is a more appropriate measure because it penalizes returns below a specific return—in this case, 1.5% above the risk-free rate. B is incorrect. The Treynor ratio penalizes returns below the risk-free rate. It will not measure the funs ability to meet the requirement of a short-term return in excess of the risk-free rate.C is incorrect. The information ratio evaluates the portfolio return relative to a benchmark. It will not measure the funs ability to meet the requirement of a short-term return in excess of the risk-free rate.Treynor就是目标回报减去无风险利率的回报，不是正好可以用来衡量题目中的特征要求么

NO.PZ202206140600000202 问题如下 Baseon the client’s investment mante, the most appropriate appraismeasure for McNeil to use is the: A.Sortino ratio. B.Treynor ratio. C.information ratio. SolutionA is correct. Given ththe funmante requirement is for a short-term return in excess of the risk-free rate, the Sortino ratio is a more appropriate measure because it penalizes returns below a specific return—in this case, 1.5% above the risk-free rate. B is incorrect. The Treynor ratio penalizes returns below the risk-free rate. It will not measure the funs ability to meet the requirement of a short-term return in excess of the risk-free rate.C is incorrect. The information ratio evaluates the portfolio return relative to a benchmark. It will not measure the funs ability to meet the requirement of a short-term return in excess of the risk-free rate. 题目里的意思是不是 组合的收益要达到一个在无风险收益的基础上+1.5%的一个目标收益率？ 也就是(rf+1.5%) 可以看做是target return 也就是可接受的最小收益率， 所以就选择soTina ratio而 TR 减去是rfIR 减去的事Rb？