Panel data—also known as longitudinal data—track the same cross‑sectional units (e.g., individuals, firms, countries) over multiple time periods. This double dimension offers significant advantages over pure cross‑sectional or pure time‑series data:
If you want, I can turn this into a downloadable PDF or a Markdown cheat sheet with code examples for each method.
If the p-value is , reject the null hypothesis. Pooled OLS is biased; use Fixed Effects. Fixed Effects vs. Random Effects (Hausman Test) stata panel data
Are you looking to add (year dummies) alongside individual fixed effects? Share public link
Visual and descriptive exploration helps you understand the variation within your dataset before moving to complex statistical modeling. Summary Statistics Pooled OLS is biased; use Fixed Effects
* Requires installation: ssc install xtscc xtscc y x, fe
All entities have observations for all time periods. Share public link Visual and descriptive exploration helps
A has observations for every unit in every time period; an unbalanced panel has missing data for some unit‑time combinations. Stata works seamlessly with both, but you should be aware that some estimators perform differently. To check the pattern, use:
It subtracts the time-series mean from each variable (within-transformation), effectively eliminating any time-invariant unobserved heterogeneity ( αialpha sub i
Each row represents a single entity-time observation. Stata requires the long format for panel data analysis.