The following are presentations and derivations. Use them as references and guides. Most of the documents are self-explanatory, but email me with any questions.

Basic Statistics and R Reports

• Book - Introduction to R Guide [PDF]
• Reference - Basic Statistics Formula Sheet [PDF]

Statistics Reports

• Presentation - Regression Graphics [PDF]
• Derivation - Ratio of Independent Exponential Distributed Variables [PDF]
• Reference - Properties of the Wishart/Inverse Wishart Distribution [PDF]

Psychometrics Reports

• Presentation - Correction for Range Restiction and Factorial Invariance [PDF]
• Presentation - Latent Growth Models and Basic SEM [PDF]
• Presentation - IRT Parameter Estimation (JMLE/MMLE) [PDF]
• Derivation - The Relationship between Spearman-Brown and Coefficient Alpha [PDF]

Mathematics Reports

• Presentation - Matrices and Trace Derivatives (Schonemann) [PDF]
• Presentation - Matrix Differentials and Derivatives (Magnus) [PDF]
• Derivation - Eulers Formula and Trig Identities [PDF]