问题如下图：
选项：
A. 
老师？这里的统计学上显著 是什么意思？
B. 
C. 
解释：
星星_品职助教 · 2019年09月23日
同学你好，
分两个方面解释，首先，“统计学上”显著的“统计学上”意思是从统计学的角度出发。或者简单理解为从抽样估计和做假设检验的角度出发。
其次，“显著”的意思是显著不为0的意思。因为原假设是H0：average abnormal return=0，所以这句话如果说全了就是：由于计算出来的t统计量大于critical value，所以拒绝原假设，average abnormal return显著的不为0.
加油
yukijiang · 2019年09月24日
average abnormal return是什么意思呢？
星星_品职助教 · 2019年09月24日
直译就是平均的超额收益（不为0）。也就是说平均来看，这个策略是可以带来超额的收益的。 其中abnormal的意思是异常，这里面就是超额的意思。因为一般情况下是基金经理无法跑赢大盘，只能赚到和大盘一样的收益。所以如果这个策略能持续的赚到超过大盘的收益，就属于“异常”，即为超额收益。这个知识点在组合和权益里还会有提到，完全仿照大盘投资的为passive investment，试图跑赢大盘赚超额收益的为active investment
NO.PZ2017092702000132问题如下analyst tests the profitability of a trang strategy with the null hypothesis being ththe average abnormreturn before trang costs equals zero. The calculatet-statistic is 2.802, with criticvalues of ± 2.756 significanlevel α = 0.01. After consiring trang costs, the strategy’s return is nezero. The results are most likely:A.statistically but not economically significant. B.economically but not statistically significant. C.neither statistically nor economically significant. A is correct.The hypothesis is a two-taileformulation. The t-statistic of 2.802 falls outsi the criticrejection points of less th–2.756 angreater th2.756, therefore the null hypothesis is rejecte the result is statistically significant. However, spite the statisticresults, trying to profit on the strategy is not likely to economically meaningful because the return is nezero after transaction costs本题的|test statistics|＞|criticvalue|，即2.802＞2.756。所以检验的结果是拒绝strategy's return=0的原假设，此时就是statistically significant。“After consiring trang costs, the strategy’s return is nezero”，说明从经济意义上是不值得去做这个策略的，即not economically significant。 Economic s是否显著是怎么判断的呢？还需要带入统计假设里面去看是拒绝H0吗？
NO.PZ2017092702000132问题如下analyst tests the profitability of a trang strategy with the null hypothesis being ththe average abnormreturn before trang costs equals zero. The calculatet-statistic is 2.802, with criticvalues of ± 2.756 significanlevel α = 0.01. After consiring trang costs, the strategy’s return is nezero. The results are most likely:A.statistically but not economically significant. B.economically but not statistically significant. C.neither statistically nor economically significant. A is correct.The hypothesis is a two-taileformulation. The t-statistic of 2.802 falls outsi the criticrejection points of less th–2.756 angreater th2.756, therefore the null hypothesis is rejecte the result is statistically significant. However, spite the statisticresults, trying to profit on the strategy is not likely to economically meaningful because the return is nezero after transaction costs本题的|test statistics|＞|criticvalue|，即2.802＞2.756。所以检验的结果是拒绝strategy's return=0的原假设，此时就是statistically significant。“After consiring trang costs, the strategy’s return is nezero”，说明从经济意义上是不值得去做这个策略的，即not economically significant。 为啥拒绝原假设 就是统计显著
NO.PZ2017092702000132 问题如下 analyst tests the profitability of a trang strategy with the null hypothesis being ththe average abnormreturn before trang costs equals zero. The calculatet-statistic is 2.802, with criticvalues of ± 2.756 significanlevel α = 0.01. After consiring trang costs, the strategy’s return is nezero. The results are most likely: A.statistically but not economically significant. B.economically but not statistically significant. C.neither statistically nor economically significant. A is correct.The hypothesis is a two-taileformulation. The t-statistic of 2.802 falls outsi the criticrejection points of less th–2.756 angreater th2.756, therefore the null hypothesis is rejecte the result is statistically significant. However, spite the statisticresults, trying to profit on the strategy is not likely to economically meaningful because the return is nezero after transaction costs本题的|test statistics|＞|criticvalue|，即2.802＞2.756。所以检验的结果是拒绝strategy's return=0的原假设，此时就是statistically significant。“After consiring trang costs, the strategy’s return is nezero”，说明从经济意义上是不值得去做这个策略的，即not economically significant。 拒绝原假设为什么要选A啊
NO.PZ2017092702000132问题如下analyst tests the profitability of a trang strategy with the null hypothesis being ththe average abnormreturn before trang costs equals zero. The calculatet-statistic is 2.802, with criticvalues of ± 2.756 significanlevel α = 0.01. After consiring trang costs, the strategy’s return is nezero. The results are most likely:A.statistically but not economically significant. B.economically but not statistically significant. C.neither statistically nor economically significant. A is correct.The hypothesis is a two-taileformulation. The t-statistic of 2.802 falls outsi the criticrejection points of less th–2.756 angreater th2.756, therefore the null hypothesis is rejecte the result is statistically significant. However, spite the statisticresults, trying to profit on the strategy is not likely to economically meaningful because the return is nezero after transaction costs本题的|test statistics|＞|criticvalue|，即2.802＞2.756。所以检验的结果是拒绝strategy's return=0的原假设，此时就是statistically significant。“After consiring trang costs, the strategy’s return is nezero”，说明从经济意义上是不值得去做这个策略的，即not economically significant。 老师这句话的意思不应该是Ha:u=0吗
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