It is the scale of measure that describes the nature of information within the values assigned to variables.

It is proportional to the underlying property, and when there is an absence of that property the number is zero.

The data are classified into names, labels, or categories.

It ranks the data from highest to lowest where differences between data values are meaningless.

Basketball uniform numbers

Ages of students in a statistics and probability class

Beauty Competition

Energy Consumption in kwh

Zip codes

Students' Letter Grades

Marital Status of the faculty at the Masla National High School

Years

Age

numbers on a wall clock

Interviewers ask research subjects to describe in some detail relationships with important people in their lives. Using established criteria, raters review these personal descriptions and assign a dominant attachment category (Secure-1, Preoccupied-2, Fearful-3, Dismissing-4).

A researcher wants to determine whether the circadian temperature cycle is less stable for older compared to middle aged adults. Body temperature in degrees Fahrenheit is measured every 15 minutes over a period of 3 days.

Children in Masla Elementary school are evaluated and classified an non-readers (0), beginning readers (1), grade level readers (2), and advanced readers (3). The classification is done in order to place them in reading groups.

During a clinical interview, survivors of a tornado are asked to state "no" or "yes" to whether they have experienced specific symptoms of Post-Traumatic Stress Disorder (PSTD) in the past week. The interviewer adds up the total number of "yes" responses.