Merger and Acquisition Autoregressive Time-Series Models R package MAARTS version 1.0.0 Implements comprehensive Merger and Acquisition ('M&A') Autoregressive ('AR') time-series models with full statistical analysis capabilities. The package provides parameter estimation, forecasting with confidence intervals (80%, 90%, 95%, 99%), descriptive statistics, stationarity tests (Augmented Dickey-Fuller ('ADF'), Phillips-Perron, Kwiatkowski-Phillips-Schmidt-Shin ('KPSS'), Dickey-Fuller Generalized Least Squares ('DF-GLS')), autocorrelation analysis (Autocorrelation Function ('ACF'), Partial Autocorrelation Function ('PACF')), model diagnostics (Ljung-Box, Box-Pierce), accuracy measures (Mean Squared Error ('MSE'), Mean Absolute Error ('MAE'), Mean Absolute Scaled Error ('MASE'), Root Mean Squared Error ('RMSE'), Symmetric Mean Absolute Percentage Error ('SMAPE'), F-statistic), residual diagnostics (normality tests, heteroscedasticity tests), model stability analysis, impulse response, information criteria (Akaike Information Criterion ('AIC'), Bayesian Information Criterion ('BIC'), Hannan-Quinn Information Criterion ('HQIC')), structural break analysis, spectral analysis, and Monte Carlo simulation. Models are based on: Kumar, Mudassir, and Agiwal (2024) <https://ph02.tci-thaijo.org/index.php/thaistat/article/view/253436>, Kumar, Mudassir, and Srivastava (2025) <doi:10.1007/s44199-025-00104-3>, Kumar and Mudassir (2025) <doi:10.19139/soic-2310-5070-2029>. Software Depends: R (>= 4.0.0) Imports: forecast, tseries, urca, stats, graphics, grDevices, utils, lmtest, sandwich, nortest, moments, strucchange, ggplot2, gridExtra, MASS, numDeriv Suggests: testthat (>= 3.0.0), knitr, rmarkdown Shikhar Tyagi <shikhar1093tyagi@gmail.com> Comprehensive R Archive Network (CRAN) Shikhar Tyagi [aut, cre] (ORCID: <https://orcid.org/0000-0003-1606-0844>), Mohd Mudassir [aut], Vrijesh Tripathi [aut] GPL-3 2026-07-26 application/tgz https://CRAN.R-project.org/package=MAARTS doi:10.32614/CRAN.package.MAARTS en-US