Period | n | Mean | Std Err | Min | Max |
02/2004-01-2006 | 918,346 | 0.022 | 0.102 | −1.955 | 1.667 |
02-2006-01-2008 | 1,149,926 | 0.021 | 0.115 | −1.947 | 1.841 |