Kinds of validity
Validity: the degree to which the results of a research study provide trustworthy information about the truth or falsity of the hypothesis.
I. Conceptual validity of the hypothesis.
The degree to which the test of a particular research hypothesis promises to make a valuable addition to existing knowledge about the behavior in question.
II. Construct validity of the variables.
The overall quality of the measurement operations used to transform the constructs in a research hypothesis into the variables in a research study.
III. Internal validity
The extent to which a causal inference can be drawn with confidence from the research.
IV. External validity
The extent to which research results can be generalized beyond the specific sample and context of the study.
V. Statistical conclusion validity
The degree to which the statistical analysis of the research results contributes to an accurate understanding of the truth of the hypothesis.