2007.01.04-2015.10.16

2007.01.04-2010.03.31

2010.03.31-2015.10.16

Mean

0.0001

0.0003

āˆ’8.61Eāˆ’06

Standard deviation

0.0201

0.0249

0.0168

Range

0.1918

0.1918

0.1740

Sample size

2134

789

1345

Levene homogeneity test of variance

3.686893 (p-value < 0.05)