Quantum Time Series Analysis: Drift, Noise Spectroscopy and Calibration Forecasting // Tools for exploratory statistical analysis of quantum-hardware calibration time series. The package provides simulators for random telegraph noise (RTN), power-law noise, and Ornstein-Uhlenbeck dephasing; Welch and sine-multitaper power spectral density estimators; a lightweight two-state hidden Markov model for switching signals; cumulative sum (CUSUM) and binary-segmentation diagnostics for calibration drift; residual-quantile interval forecasts; and filter-function calculations for illustrative coherence curves. The package includes a reproducible generator of simulated superconducting-qubit calibration records; it does not retrieve authenticated live provider data. Methodological background is provided by Welch (1967) doi:10.1109/TAU.1967.1161901, Thomson (1982) doi:10.1109/PROC.1982.12433, Rabiner (1989) doi:10.1109/5.18626, Page (1954) doi:10.1093/biomet/41.1-2.100, Paladino et al. (2014) doi:10.1103/RevModPhys.86.361, and Cywinski et al. (2008) doi:10.1103/PhysRevB.77.174509.