Statistics Blog
Structural Equation Modeling (SEM): Formula, Example and How to Report SEM Results
SEM formula, two-step approach, SEM vs path analysis, fit guidelines, non-normal data and an APA7 reporting template.
Principal Component Analysis (PCA): What It Is, How It Works and a Free Online PCA Tool
PCA formula, example, scree and loading plots, interpretation, PCA vs factor analysis, R and Python code.
Best Free Data Analysis Software and Tools in 2026: StatFas vs SPSS, R, JASP, jamovi and Excel
Compare free and paid data analysis tools for research by cost, file formats and publishable results.