Stata Panel Data Exclusive |top|

The Fixed Effects model explores within-unit variation. It subtracts the time-series mean from each variable, effectively eliminating αialpha sub i

In macro-panels (e.g., countries or states), shocks to one unit often spill over into neighboring units. Use Pesaran’s CD test to check for this cross-sectional correlation. quietly xtreg y x1 x2 x3, fe xtcsd, pesaran abs Use code with caution. The Ultimate Correction Command

reshape long y, i(id) j(year)

If the test rejects homoskedasticity, use robust standard errors: xtreg y x1 x2, fe robust . stata panel data exclusive

After estimation, use estat abond to test for serial correlation in the first-differenced residuals and estat sargan to test overidentifying restrictions.

Here is a guide on how to create, manage, and interpret exclusive dummy variables in Stata panel data.

* 1. Run and store Fixed Effects xtreg y x1 x2 x3, fe estimates store fe_model * 2. Run and store Random Effects xtreg y x1 x2 x3, re estimates store re_model * 3. Run the Hausman test hausman fe_model re_model Use code with caution. If the p-value is small ( ), reject the null hypothesis. Use Fixed Effects . 3. High-Dimensional Fixed Effects (HDFE) The Fixed Effects model explores within-unit variation

For a comprehensive battery of pre‑test diagnostics in a single command, the user‑written package xtpretest (available via ssc install xtpretest ) runs homogeneity, slope heterogeneity, cross‑sectional dependence, and structural break tests at once.

Use xtsum to decompose variance into (across time) and between (across units) components. xtsum varname Use code with caution. Visualizing Trends

: These operators mean "not equal to," allowing you to exclude specific years or IDs from your analysis. quietly xtreg y x1 x2 x3, fe xtcsd,

After xtreg, fe :

: If you include a set of mutually exclusive dummy variables that cover all possible groups along with a constant, Stata will drop one category to prevent the "dummy variable trap." The Solution

: Consult the Longitudinal-Data/Panel-Data Reference Manual (698 pages, Stata Press 2025), and explore Baltagi's Econometric Analysis of Panel Data , Sixth Edition—both essential companions to your Stata panel data journey.

Example: