Uncertainty Analysis in Dynamic Site and Slope Response R package newmark version 1.3.0 Implements a four-stage pipeline for probabilistic seismic performance analysis of slopes and embankments. The package takes a uniform-hazard spectrum at multiple return periods as input (any source) and produces: (1) synthetic soil profile generation and fundamental period estimation from USCS classification via Ishihara's small-strain shear-modulus model and the inhomogeneous truncated shear-beam theory of Gazetas and Dakoulas; (2) nonlinear site amplification using the NGA-East ergodic site-response models (Stewart et al. (2020) <doi:10.1177/8755293019878185> and Hashash et al. (2020) <doi:10.1177/8755293019878193>, with the 2017 PEER-report generation retained as an option), with inter-period correlation via Baker & Jayaram (2008) <doi:10.1193/1.2857544>; (3) Monte Carlo ensemble of six empirical Newmark sliding-block displacement models (Ambraseys & Menu (1988) <doi:10.1002/eqe.4290160704>, Jibson (2007) <doi:10.1016/j.enggeo.2007.01.013>, Saygili & Rathje (2008) <doi:10.1061/(ASCE)1090-0241(2008)134:6(790)>, Bray & Travasarou (2007) <doi:10.1061/(ASCE)1090-0241(2007)133:4(381)>, Bray & Macedo (2017) <doi:10.1016/j.soildyn.2017.05.024>, and the Bray and Macedo shallow-crustal update) with coherent correlated draws; (4) log-log inversion to the performance-based seismic coefficient kmax at user-specified displacement targets. All outputs are 'data.table' objects. Software Depends: R (>= 4.2) Imports: data.table, digest, Hmisc, mvtnorm, randomForest, rpart, readxl, stats, stringr, triangle, utils Suggests: testthat (>= 3.0.0), knitr, rmarkdown, devtools Alejandro Verri Kozlowski <averri@fi.uba.ar> Comprehensive R Archive Network (CRAN) Alejandro Verri Kozlowski [aut, cre, cph] MIT + file LICENSE (https://CRAN.R-project.org/package=newmark/LICENSE) 2026-07-16 application/tgz https://CRAN.R-project.org/package=newmark doi:10.32614/CRAN.package.newmark en-US