One comment

  1. DougRoberts · December 14, 2010

    I’d be reluctant to generalize the 2002-2006 data to the 2006-2010 data. There’s massively more of the earlier period, suggesting that the response is different.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s