x

Exact value [27]

Standard VPM

VPM with h

0.1

0.9983367

1.1052640

0.9983365 (h = −0.3)

0.2

0.9933862

1.4239908

0.9933862 (h = −0.39)

0.5

0.9603109

3.744834

0.960307 (h = −0.39)

1

0.8608138

9.334329

0.860813 (h = −0.36)