NO.PZ2020011101000015
问题如下:
Suppose all residual autocorrelations are , where T is the sample size. Would these violate the confidence bands in an ACF plot?
选项:
解释:
No, the confidence bands are and so these would not. If many autocorrelations are jointly relatively large, then this series is likely autocorrelated. A Ljung-Box test would likely detect the joint autocorrelation.
印象中好像有个公式:方差/根号下n,计算样本标准误的吧。这里的1.5/ 根号下T、1.96根号下T,是什么意思?