Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

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.

View full-text article in PMC

. 2013 Dec 30;8(12):e83847. doi: 10.1371/journal.pone.0083847

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2013 Ros et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

PMC Copyright notice

To determine the number of representatives for a cluster we use a two stage approach. As long as the number of tracts in cluster is smaller than , is selected in dependency of using either a linear or a nonlinear function (stage 1). If is larger than , is set to a constant value (stage 2).

Inline graphic — To determine the number of representatives for a cluster we use a two stage approach. As long as the number of tracts in cluster is smaller than , is selected in dependency of using either a linear or a nonlinear function (stage 1). If is larger than , is set to a constant value (stage 2).