NEWS

---

segen 2.0.1 (2026-09-07)

• Removed all contributed runtime dependencies. Only standard R libraries remain in Imports; testthat, knitr and rmarkdown are development suggestions.
• Added internal mapping, dummy encoding, moments, shorth mode, entropy, distance and forecast metric calculations.
• Replaced DTW with an internal symmetric2 dynamic-programming recurrence.
• Replaced future/furrr with standard parallel PSOCK workers and guaranteed worker cleanup on exit.
• Replaced digest hashing with a bounded, single-entry exact-input cache.
• Plots now use base graphics through plot()/print() methods for segen_plot objects. Adding ggplot2 layers is no longer supported.
• Numeric imputation now uses linear interpolation with constant endpoints; categorical gaps use the most frequent level. Loess uses span 0.75 and degree 1. These are intentional behavioral changes from 2.0.0.
• Binary entropy now uses empirical category frequencies. Percentage errors use percentage units; near-zero metric denominators are bounded at 1e-8.
• Integrated the point forecast before combining it with integrated draws.
• Updated vignette, namespace, dataset documentation and regression tests.

segen 2.0.0 (2025-08-19)

• Added the segen-introduction vignette with numeric, reproducibility, and optional-method examples.
• Added early validation for integer controls, error scaling options, and parallel worker counts.
• Replaced tictoc, readr, and scales usage with base R equivalents.
• Moved DTW and parallel execution packages to Suggests; sequential execution remains the default.
• Strengthened distance-cache keys so distinct input matrices cannot collide merely because they share dimensions, mean, and standard deviation.
• Added tests for validation and cache correctness.
• Removed the mandatory philentropy dependency and implemented the categorical distance calculations internally.
• Removed stale namespace imports for optional packages and utility packages; DTW and parallel execution are accessed only when explicitly requested.
• Repaired package metadata so devtools::document() does not reintroduce removed dependencies.

segen 1.2.0

• Fixed mixed-type detection bug (class_index now per-column; strict all-numeric OR all-categorical check).

• Corrected best_deriv() p-values length/off-by-one and added short-series guard.

• Patched doxa_filter() binary clamp (now clamps to [0,1] instead of < 1 typo).

• Hardened metrics: added safe_scale() to avoid zero/NA scale; fixed benchmark to use mean(actuals) for "average".

• Validated inputs (ci, windows, samples, dates length) and added early error for too-short series.

• Stabilized weight rescaling/min-max with zero-range handling; vectorized ensemble normalization.

• Improved date handling for plots/outputs (consistent step; correct future index).

• Reduced brittleness/perf costs (preallocation where useful, safer splitting, fewer coercions) and kept seed propagation for reproducibility.

• Added compute_distance() with memoized caching and new methods: "correlation" (1−corr) and "dtw" (guarded on dtw pkg).

• Replaced Gaussian weight sampling with kernel weights vs. the most recent window + Dirichlet draws for uncertainty (faster, stabler).

• Implemented conformal prediction: CI bounds now calibrated from rolling residuals; plot uses these bounds at the requested ci.

• Introduced optional parallelism (use_parallel, parallel_workers) using furrr/future with seeded execution; falls back to sequential if unavailable.

• Enabled distance-matrix caching (via digest when present) for reuse across samples and to cut repeated computation.

• Kept API backward-compatible; new options default off and legacy distance methods unchanged.

segen 1.1.0 (2022-08-15)

• Rationalization and streamlining of processes.

segen 1.0.0 (2022-06-28)

• Added a NEWS.md file to track changes to the package.