Threats to Internal Validity Internal validity is concerned with the rigor (and thus the degree of control) of the study design. The degree of control exerted over potential extraneous variables ...

This paper develops an account of rigour in the use of thought experiments in ethics. I argue that there are two separate challenges to be faced. The first is internal validity: is the thought ...

Examples of tests with predictive validity are career or aptitude tests, which can help determine who is likely to succeed or fail in certain subjects or occupations.

Variability is inevitable in experiments owing to both biological and technical effects. Whereas technical variability should be tightly controlled to enhance the internal validity of the results ...

The results of testing for data quality, reliability, and validity are presented following a Norwegian survey. Methods: Following a literature review and consultation within an expert group six items ...

Establishing the Internal and External Validity of Experimental Studies Marion K. Slack and Jolaine R. Draugalis Disclosures Am J Health Syst Pharm. 2001;58 (22) Establishing Generalizability ...