Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Fit statistics for out-of-sample population projections (number of people in thousands) of US Counties in 2010 and 2015. Projections generated by naïve extrapolation from equations fit with data through 2005.
| Test Statistics | 2010 | 2015 |
|---|---|---|
| Root mean square error | 11.0989 | 18.0460 |
| Mean percentage error | 0.2984 | 2.2551 |
| Mean absolute error | 2.8682 | 4.6745 |
| Mean absolute percentage error | 3.0975 | 5.1198 |
