Levels of measurement
Data can also be classified according to how it is
measured, or its
level of measurement
The level at
which data can be measured is important because it
determines what calculations can be performed.
higher the level of measurement, the more informative
the analysis that can be performed.
Qualitative data use either the
level of measurement.
level of measurement—used for qualitative
variables that can only be categorized and counted.
For example, the types of memberships sold at a
health club in Columbia (Individual, Family, Trial, or
Other examples of nominal level data:
Make of car (Ford, Lexus, Toyota, etc.)
State of residence (SC, GA, MA, PA, NC, VA,
Type of dwelling (house, condo, apartment, etc.)
level data—qualitative data that can be
placed into ordered categories.
The orders may be
according to which is “best”, or “larger”, or “more
For example, year in college (freshman, sophomore,