${\overline{\theta }}_t$

0.1

0.3

0.5

0.7

0.9

Nonstationary filter $\wp$

1.2468

1.3219

1.3303

1.3749

1.3520

Asynchronous filter $\wp$

1.5168

1.4904

1.4357

1.4535

1.5364