DID with switching treatments for panel data
The new xtswitchdid command handles both multivalued treatment and groups that switch in and out of treatment.
Multilevel model spatial-error structures
The mixed command now supports four spatial-error covariance structures: exponential, Gaussian, spherical, and power. These structures let you model correlation between errors as a function of distance computed from coordinate variables.
Frames in the Data Editor
Now you can simultaneously view multiple datasets from the Data Editor, easily make changes to these datasets, copy from one frame and paste into another, and much more.
Bayesian half-distribution and square-root parameter priors
The bayes and bayesmh commands now support six new priors.
Append PDFs
The new putpdf append command allows you to append PDFs to create a single document.
Customized tables: collect from data frames, label missings values, and more
The collect suite of commands now allows you to create and customize tables in new ways.
For a full overview of each feature, visit Stata's website.