Changes in version 1.2.0 (2026-03-16)                  

Data and Documentation

  - Added built-in dataset pm10 (1826 x 8) from dataset/pm10data.csv.
  - Added dataset help page ?pm10.
  - Added a new vignette in vignettes/pm10-example.Rmd showing robust
    covariance/correlation, robust ACF, and robust GPH estimation with
    pm10.

                        Changes in version 1.1.0                        

Performance

  - Optimized corQn() and covQn() to reduce temporary allocations and
    redundant computations.
  - Reworked corMatQn() and covMatQn() to cache per-column Qn scales and
    compute symmetric matrix entries once.
  - Optimized robacf() internals to avoid repeated scale recomputation
    in multivariate settings.
  - Reduced loop overhead in PerioMrob(), PerQn(), and GPH_estimate()
    while preserving formulas and returned values.