EconLab: Econometrics + Code

EconLab is a pocket reference for applied econometrics — from the basics to advanced methods — with ready-to-run R, Python, and Stata code and 750 practice questions. Built for students, researchers, and data analysts who want the right method and the exact commands, fast, and fully offline. 30 methods across 6 areas • Foundations: OLS, regression diagnostics, dummy variables & interactions, functional form • Panel Data: fixed effects, random effects & Hausman, difference GMM, system GMM • Time Series: stationarity & unit roots, ARIMA, VAR, cointegration & VECM, ARDL, ARCH/GARCH • Causal Inference: instrumental variables (2SLS), difference-in-differences, regression discontinuity, propensity score matching, synthetic control • Limited Dependent Variables: logit, multinomial logit, ordered models, Tobit, Poisson & negative binomial, Heckman selection • Advanced: quantile regression, structural equation modeling, spatial econometrics, NARDL, Markov-switching Every topic gives you: • A clear explanation — concept, when to use it, key assumptions • How the method is estimated, how to read the output, and the common pitfalls • Ready-to-run code in R, Python, and Stata, with a one-tap copy button • 25 practice questions, each with an explanation of the answer • Curated references and further reading in APA style, each with one-tap copy • A difficulty badge (Basic / Intermediate / Advanced) 750 practice questions Test yourself on any topic: 25 multiple-choice questions per method, 750 in total. Every answer comes with a short explanation of why it is right, so a wrong answer teaches you something. Finished a round? Retake just the questions you got wrong. Your best score per topic is saved on your device. Find the right method • Method wizard: answer a few questions about your data — cross-section, panel, time series, or a causal design — and get a shortlist of candidate methods, each with the assumptions to check before you commit • Cheat sheet: the key command for all 30 methods on one screen, in R, Python, or Stata • Search that reads the explanations, the code, and the practice questions — not just the titles Fast and offline Browse by area, switch between R, Python, and Stata (the app remembers which you use), and work entirely offline — no account, no ads interrupting your work. EconLab turns "which method do I use, and how do I run it?" into a quick lookup. Keep it next to your laptop while you analyse data. Note: content is written for educational reference. Always adapt code and assumptions to your own data and consult primary sources for formal work.