Not constant in appearance.
Procedures based on actual values in terms of numerical scales in contrast to attributes where each item is designated merely as acceptable or unacceptable.
A concept defined so that its magnitude can be measured.
A characteristic (e.g. morbidity, life style, or habit) relating to a single individual or group. Qualitative variables are descriptive characteristics, such as sex, race, or occupation; quantitative variables relate to a numerical scale and are subdivided into discrete variables, found only at fixed points (e.g. number of children), and continuous variables, found at any point on a scale (e.g. weight).
Any changing, measurable thing. In statistics, it is often possible to measure and graph the relationship of one variable to another (e.g., height and weight in the growing child).