Quantitative Validity

1. Internal Validity

1.1. Causal Description

1.2. Causal Explanation

1.3. Threats to Internal Validity (Single-Group)

1.3.1. History

1.3.2. Maturation

1.3.3. Testing

1.3.4. Instrumentation

1.3.5. Regression Artifacts

1.4. Threats to Internal Validity (Multi-group)

1.4.1. Differential Selection

1.4.2. Additive and Interactive Effects

1.4.2.1. Selection-history effect

1.4.2.2. Selection-maturation effect

1.4.2.3. Attrition

1.4.2.4. Differential Attrition

1.4.2.5. Selection-testing effect

1.4.2.6. Selection-instrumentation effect

1.4.2.7. Selection-regression effect

2. External Validity

2.1. Threats to External Validity

2.1.1. Temporal Validity

2.1.2. Outcome Validity

2.1.3. Treatment Variation Validity

2.1.4. Ecological Validity

2.1.5. Operationalism

2.1.6. Population Validity

2.1.7. Construct Validity

3. Construct Validity

4. Statistical Conclusion Validity