Census

The Importance of The Margin of Error

Even the best poll or survey is slightly inaccurate, because a poll of a sample of people may not accurately reflect the entire population.  To account for this problem, pollsters have developed the concept of a "margin of error"- a number (usually 2 to 5 percentage points) which shows the rang... read more »

Don't Take Yearly Census Estimates Too Seriously

Every year, the Census comes out with estimates of county population.  Because the 2011-12 estimates showed big gains for most urban counties, urbanists were happy to declare victory, and to claim that these estimates showed a movement of population back to cities.  In other years, Census ... read more »