Major group

Break point

QLR test statistic

Minor group

Break point

QLR test statistic

McKenzie

August 2006

14.87 (<0.001)

Divide

September 2006

5.19 (0.015)

Mountrail

September 2006

13.02 (<0.001)

Bowman

July 2006

25.98 (<0.001)

Williams

September 2006

10.15 (<0.001)

Burke

July 2006

6.29 (<0.001)

Dunn

September 2006

9.16 (<0.001)

Major group

September 2006

10.6 (<0.001)

Minor group

January 2004

7.34 (<0.001)

North Dakota

January 2006

7.65 (<0.001)