If possible, it might be interesting to compare the data for Arizona with neighboring states. Apparently Arizona does not observe daylight savings time. While

If possible, it might be interesting to compare the data for Arizona with neighboring states. Apparently Arizona does not observe daylight savings time. While the conclusions from such a comparison may not necessarily apply to more northern states, it would give an additional point of reference. (It's a pity they don't have data for Indiana in 2005, which only went to daylight savings time in 2006...) http://en.wikipedia.org/wiki/Time_in_the_United_States#Daylight_saving_time http://en.wikipedia.org/wiki/Time_in_the_United_States#Dayli...