Pólya Tree Type Models R package PTT version 1.0 Fits Bayesian nonparametric models based on Pólya tree processes, including adaptive Pólya trees, Markov adaptive Pólya trees, optional Pólya trees, and their conditional-density counterparts. Methods are described in Ma (2017) <doi:10.1214/16-BA1021>, Ma (2017) <doi:10.1214/17-EJS1254>, and Wong and Ma (2010) <doi:10.1214/09-AOS755>. Software Imports: Rcpp (>= 1.0.0) LinkingTo: Rcpp, RcppArmadillo Li Ma <mastatlab@gmail.com> Comprehensive R Archive Network (CRAN) Li Ma [aut, cre] GPL (>= 3) 2026-07-22 application/tgz https://CRAN.R-project.org/package=PTT doi:10.32614/CRAN.package.PTT