Variables and measures

Variables and measures

1. Measurement is the process of assigning numbers to objects, events or situations. The instruments are selected to measure specific variables of a study.

2. Nominal scale measure: contains values ​​that indicate a relationship with one or more categories (for example, gender, marital status)

3. Ordinal scale measure: contains non-numeric values ​​that indicate an order. (for example, gold, silver, bronze)

4. Discrete scale measurement: can only take a finite number of values ​​between Two values ​​of a characteristic. (for example, number of children 1,2,3,4)

5. Continuous scale measurement: can take an infinite number of values Between two values ​​of a characteristic. (for example, height 1.63m, 1.78m)

6. Reliability: robustness of the measurement method; Express the measure of that a measure provides similar results when it is performed more than once under the same conditions.

   • It includes reproducibility, internal consistency and limits of agreement.

7. Validity: expresses the degree to which a measure measures what it is intended for. Includes appearance (facial) validity, content, construction and criteria.