Paul Christiansen is a professor in statistics at the Department of Psychology in University of Liverpool. He is interested in research integrity with a particular focus on accurate measurement (psychometrics). He works across a range of fields in Psychology (appetite and obesity, addiction, forensic and health psychology) as well as medical research.

Section 1: Key Foundations

1.1. Introduction
1.2. Key Early Figures in Quantitative Methods
1.3. Understanding Psychological Phenomena Through Numbers
1.4. The Types of Numerical Data We Encounter and Their Properties

Section 2: Key Theories: An Overview of the Key Theories and Models Relevant to the Topic
2.1. Experimental Models
2.2. Quasi Experimental Models
2.3. Correlational Models
2.4. Sampling Theory
2.5. Null Hypothesis Significance Testing

Section 3: Key Methodologies: Which Research Techniques Are Typically Used for Research on this Topic
3.1. Sampling Methods
3.2. Testing Associations
3.3. Comparing Differences

Section 4: Key Impacts on Research or Practice and Policy: What Wider Impact Has This Topic Had on the Field/Other Fields/Practice/Policy
4.1. Robust Quantitative Methods and Ecological Validity of Studies
4.2. Robust Quantitative Methods and Reliability of Studies

Section 5: Key Emerging Areas: Where Is the Research Headed
5.1. Reproducibility Crisis
5.2. Increasing Reproducibility
5.3. Inclusivity in Research