# Theory

## Video lectures

- Causality and Explanation
- Cross sectional studies
- Interpreting bivariate tables
- The effect of Third Variables
- The effect of Third Variables: addition
- The effect of Third Variables: confounding
- The effect of Third Variables: general
- The effect of Third Variables: interpretation
- The effect of Third Variables: modification
- The Empirical Cycle
- The validity of causal research
- Time order in causal relationships
- Various types of bivariate relationships