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- Define external validity in research.
- Understand why internal validity and replication are required for external validity.
- Explain why generalization is essential to external validity.
- Identify threats to external validity.
- Describe methods for increasing external validity.
1. What is External Validity in Research? - Definition & Examples
The purpose of research is to say something about the real world. But how can a researcher generalize results to the world at large? In this lesson, we'll answer that question as we learn about external validity.
2. Requirements of External Validity: Internal Validity & Replication
In order to generalize results from studies to the real world, there are a couple of things that are required. In this lesson, we look at the requirements for external validity: replication and internal validity.
3. Generalization & External Validity
The point of research is to be able to generalize findings to the world at large. In this lesson, we'll look at three types of generalizing that make up external validity: across subjects, from procedures to constructs, and beyond the lab.
4. Threats to External Validity: Sample Characteristics, Stimulus Characteristics & Experimental Arrangements
The goal of research is to generalize the results, but there are several things that can get in the way. This lesson examines three threats to external validity: sample characteristics, stimulus characteristics, and multiple-treatment interference.
5. How Novelty Effects, Test Sensitization & Measurement Timing Can Threaten External Validity
The purpose of research is to find things out about the world at large. But there are several things that can get in the way of external validity. In this lesson, we'll examine novelty effects, test sensitization, and measurement timing.
6. Reactivity of Experimental Arrangements & Assessment: Threats to External Validity
The goal of research is to say something about what happens in the real world. But what happens if subjects react to the experimental conditions? In this lesson, we'll look at two reactivity threats to external validity.
7. Methods for Increasing External Validity
External validity is a key component of research. In this lesson, we'll look at several different ways to increase external validity, including aggregation, nonreactive measures, and field research.
8. Ecological Validity in Psychology: Definition & Explanation
Ecological validity refers to the extent to which the findings of a research study are able to be generalized to real-life settings. Learn about ecological validity, how it differs from external validity, and more.
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Other chapters within the Research Methods in Psychology: Tutoring Solution course
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