$s_{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}}
\over \beta } ,Boot}^2 = \frac{1}{{B - 1}}\sum\limits_{b = 1}^B {{{{\rm{(}}\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}}
\over \beta } _b^* - {{\bar \mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}}
\over \beta } }^*}{\rm{)}}}^2}} $
结果报告错误：
! Missing { inserted.<to be read again>                    \mathord l.186 \over \beta } _b^* - {{\bar \mathord                                          {\buildrel{\lower3pt\hbox{$\script...