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Stata 15 is remarkable for its sheer size. I'll list some highlights here and make some snappy comments, but I make about 20 pages of comments on the blog entry I am about to post, which will be a record. The most thorough coverage, of course, is at the Stata 15 features page at the stata.com website.

Here are sixteen of the highlights:

**Extended regression.**It fits continuous, binary, ordered responses with (1) endogenous covariates, (2) endogenous (Heckman-style) selection, and (3) endogenous treatment effects. This command does a lot and is easy to use.

**Latent class analysis.**Binary outcomes. Ordinal outcomes. Continuous outcomes (latent profile analysis). Even incorporate latent classes in path models.

**Bayesian prefix command.**You can now type -bayes:- in front of estimation commands to fit Bayesian regression models for over fifty likelihoods. And multilevel models are among them!

**Dynamic stochastic general equilibrium (DSGE) models.**Fit structural macro models based on theory with lots of equations. Graph impulse-response functions afterward.

**Markdown for Stata.**You can now combine Markdown text with executable Stata code to produce web containing prose, Stata output, parts of Stata output, and graphs. By parts, we mean you can write a sentence such as "The F statistic is 52.4 and ...", where the 52.4 is obtained from -e(F)-.

**Nonlinear mixed-effects models.**Because some problems are just not linear in the parameters.

**Spatial autoregressive models (SAR).**Download shapefiles from the web, merge with your geographic-based data, and fit your SAR models with cross-sectional or panel data.

**Interval-censored parametric survival-time models.**For when you only know a time when subjects have not yet failed and another when they have already failed.

**Finite mixture models (FMMs).**The new -fmm:- command is a prefix command. You mix one or more regression models using any of 17 existing estimation commands.

**Mixed logit models.**Discrete choice models with random coefficients, meaning you can relax the IIA assumption.

**Nonparametric regression.**Our implementation uses kernel methods. Bootstrap standard errors. Graph slices after fitting. Predict derivatives or levels.

**Power analysis for cluster-randomized designs (CRDs) and for regression models.**You can now add your own power and sample-size methods too.

**Word and PDF documents.**It's now just as easy to produce Word and PDF documents as it is to produce Excel worksheets.

**Graph color transparency/opacity.**Stata's colors used to be fully opaque, which is to say, not-at-all transparent. Now you can change them so that you can see what's underneath.

**ICD-10-CM/PCS support.**These are the codes from NCHS and CMS that are mandated for all medical billing in the U.S. Support means a database system that can even manage codes from different versions in one file!

**Federal Reserve Economic Data (FRED) support.**470,000 U.S. and international economic and financial time series are available to registered users courtesy of the St. Louis Federal Reserve Bank. You should register. It's free and easy. If you do, Stata can browse, search, and assemble datasets for you.

- Bayesian multilevel models
- Threshold regression
- Panel-data tobit with random coefficients
- Multilevel regression for interval-measured outcomes
- Multilevel tobit regression for censored outcomes
- Panel data cointegration tests
- Tests for multiple breaks in time series
- Multiple-group generalized SEM
- Heteroskedastic linear regression
- Poisson models with Heckman-style sample selection
- Panel-data nonlinear models with random coefficients
- Bayesian panel-data models
- Panel-data interval regression with random coefficients
- SVG export
- Bayesian survival models
- Zero-inflated ordered probit
- Add your own power and sample-size methods
- Bayesian sample-selection models
- And even more in statistics
- Stata in Swedish
- Improvements to the Do-file Editor
- Stream random-number generator
- Improvements for Java plugins
- More parallelization in Stata/MP

Visit our blog and our features page to learn more.

Stata 15 is in distribution now.

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