For a research, we are using county level data for fatal car accidents. However, this data is very sparse for counties with small populations. I would like to know if there is a guideline for merging (aggregating) data of counties with small populations. In other words, is there any unit of analysis that is finer than states but larger than counties with considerable population.

  • What is the connection of this question to Open Data? You may want to go to the Data Science stackexchange with the question of how to aggregate sparse data. – user6083 Mar 17 '16 at 9:25
  • 2
    This question is better placed on teh Data Science stackexchange – user6083 Mar 17 '16 at 9:26
  • if this is county produced or census data, its open data. – albert Mar 17 '16 at 15:24

Census has Metropolitan and Micropolitan Statistical Areas
as well as Combined Statistical Areas (CSA):
and CBSA (Core Based Statistical Areas):

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