2.- The experimental control. Validity |
2.1. Total variance, systematic variance, variance error.
2.2. Maximize, minimize, control.
2.3. Technicians of control of the variance.
- Primary systematic variance
- secondary systematic Variance
- Variance error
2.4. Internal validity.
2.5. External validity |
4.- Designs quasi-experimentales |
5.1. Preexperimental desings and quasi-experimental desings
5.2. Time series desing
5.3. Case study research |