R Code

• principal component analysis [download]

• clustering (hierarchical, model-based, PAM, self-organizing maps, fuzzy c-means) and internal valuation criteria (silhouette width, Calinski-Harabaz index, Dunn index, Davies Bouldin index) [download]

• data envelopment analysis [download]

• mean comparison (tuckeyHSD) [download]

• cross-tabulation [download]

• 2d plots [download]

Stata Code

• panel data descriptive statistics [download]

• panel regressions (pooled, xtreg, xtiv/2sls, gmm, 3sls) [download]

• cross-section regressions (ols, iv/2sls, 3sls) [download]

• test for equality of coefficients [download]

• propensity score matching [download]

Note: Please reference the authors of each software package when using it in your research.