HRS 610 Lecture Notes - Lecture 5: Dependent And Independent Variables, Internal Validity, Operational Definition

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Research process: phases of the research process. Research questions: three types of research questions: Operational definitions: operational definitions allow us to define constructs in a way that is measurable, as a result, data is more easily collected to test the research question, and the investigation can be replicated. Operational definitions: operational definitions will always have limitations. It may be incomplete or greatly simplify the construct. Different operational definitions may be used across studies measuring the same construct. Why is this a problem: construct validity refers to the adequacy of the operational definition to measure the variable of interest, how do we guard against some of the limitations of operational definitions, examples: The scores of brief, self-rated instruments designed to quantify depressive symptomology. The number of times a person makes a negative statement about him/herself in one hour. A diagnosis of depression by a psychiatrist/psychologist.

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