${\xi }_2=0.4$

${\xi }_2=0.3$

${\xi }_2=0.2$

n

$\tau$

$\widehat{\tau }$

$\left|\frac{\widehat{\tau }}{n}-\frac{\tau }{n}\right|$

$\widehat{\tau }$

$\left|\frac{\widehat{\tau }}{n}-\frac{\tau }{n}\right|$

$\widehat{\tau }$

$\left|\frac{\widehat{\tau }}{n}-\frac{\tau }{n}\right|$

100

50

35

0.15

31

0.19

30

0.2

200

100

88

0.06

85

0.075

82

0.09

500

250

245

0.01

241

0.018

241

0.018

1000

500

494

0.006

493

0.007

491

0.009