Statistical Methods for Comparative Studies: Techniques for Bias Reduction
Expressing the Treatment Effect.
Randomized and Nonrandomized Studies.
Some General Considerations in Controlling Bias.
Standardization and Stratification.
Analysis of Covariance.
Analyzing Data From Premeasure/Postmeasure Designs.
Choice of Procedure.
Considerations in Assessing.
Association and Causality.