The phrase "a set of counties" is correct and usable in written English.
It can be used when referring to a specific collection or grouping of counties, often in a geographical or administrative context.
Example: "The project will focus on a set of counties that have been significantly affected by the recent flooding."
Alternatives: "a group of counties" or "a collection of counties."
We included personal characteristics, linked with a set of county and state-level predictors based on residence.
Each NMMAPS community is based on a single county or a set of contiguous counties.
The communities are listed in the Appendix and consist of urban areas based on a county or a set of contiguous counties.
Using the U.S. civil rights movement as a case study, I assembled a data set of counties that did and did not experience peaceful civil rights protests before Congress passed the Voting Rights Act in 1965.
The figures will be used by Pickles in a battle to defend his broader record in local government in what may well be a difficult set of county council elections in May.
And then there are the terms themselves, which include a fuzzy set of county obligations that Mr. Parola estimated could swell to $27.6 million over five years, a figure that Mr. Smits said was inflated.
And now the Urban Institute has created a useful set of county-level maps of public-school segregation drawn from the Department of Education's National Center for Education Statistics that helps make this clear.
Children were sampled by occurrence of birth within a set of primary sampling units defined by counties or county groups.
Thirty years later, psychologists could measure in which set of counties the resulting young adults are more creative, self-confident, law-abiding, prosperous, and happy.
Finally, by using this expanded set of counties, and matching it to publicly available data, we were able to examine a set of population characteristics as explanatory variables for the observed variation in results.
