Some road type classifications are influenced by city size, traffic density, and regional conventions. For example, in a very large city a primary street may have three or more lanes in each direction on a divided road. While in a town of dirt roads, the only paved single lane street could be a primary street.
subset - a set whose members are members of another set; a set contained within another set. set - (mathematics) an abstract collection of numbers or symbols; the set of prime numbers is infinite. Translations. podmnoÅ¾ina.
One definition refers to the subset of all data values in each of those parts. For example, if I say my score was in the upper quartile on that math test, I mean that my score was one of the values in the upper quartile subset (i.e. the top 25% of all scores on that test). But the terms can also refer to cut-off values between the subsets.