Panel Data Analysis and DiD Tools Online
Models for data that follow the same units over time: fixed and random effects with the tests that choose between them, and difference-in-differences with an event study for policy evaluation.
Panel Data Regression: Fixed and Random Effects
Pooled OLS, fixed effects, random effects, two-way FE and first differences side by side, with F, Breusch-Pagan LM and Hausman tests.
Replaces Stata xtreg · EViewsHausman Test: Fixed vs Random Effects
Choose between fixed and random effects for panel data, with the full coefficient comparison and supporting F and LM tests.
Replaces Stata hausmanDifference-in-Differences (DiD) Analysis
Classic 2×2 DiD, two-way fixed effects and an event-study plot with a pre-trend test, with clustered standard errors.
Replaces Stata · R fixestPanel Data Regression: Fixed and Random Effects
Use panel models when the same entities (firms, countries, people) are observed over several periods, to control for unobserved heterogeneity.
Hausman Test: Fixed vs Random Effects
Run it whenever you must justify fixed or random effects in a panel study.
Difference-in-Differences (DiD) Analysis
Use DiD to evaluate a policy, programme or event that affected some units and not others, when you observe both groups before and after.
Other categories
Data cleaning and preparation · Describe and explore · Compare means · Nonparametric tests · Correlation and regression · Bayesian statistics · Categorical data · Reliability and agreement · Multivariate analysis · Structural equation modeling · Econometrics and time series · Marketing and decision research · Survival, clinical and meta-analysis · Study planning and calculators · PLS-SEM