Changes in version 1.4.0 (2026-03-30)                  

New Modules

  - Budget Impact Analysis -- 5-year BIA framework with population
    sizing, uptake curves, and discounting (ISPOR Good Practice
    guidelines).
  - PPP Currency Converter -- Purchasing Power Parity conversion
    across 30 countries (World Bank 2022 ICP data), market exchange rate
    comparison, and WHO-CHOICE WTP threshold assessment (1x and 3x GDP
    per capita).

New Conversions

  - OR to RR / RR to OR -- Convert between Odds Ratios and Relative
    Risks using baseline risk (Zhang & Yu 1998 method).
  - Effect Size Transformations -- Convert between SMD and log(OR) using
    the Chinn (2000) formula for network meta-analysis preparation.
  - Standalone NNT/NNH Calculator -- Calculate Number Needed to Treat
    from four input modes: ARR, RR + baseline, OR + baseline, or direct
    probabilities.
  - Log-rank to HR -- Estimate Hazard Ratios from published log-rank
    chi-square or p-value using the Peto approximation.

New Distributions and Models

  - Dirichlet Distribution -- Fit Dirichlet parameters for multinomial
    transition probabilities in Markov models (via Gamma decomposition).
  - Log-Logistic Survival -- Third survival extrapolation option with
    non-monotonic (hump-shaped) hazard support.
  - Annuity / PV Stream Calculator -- Present value of recurring annual
    costs (ordinary annuity and annuity due).

Interface Improvements

  - Global Currency Selector -- Switch between INR, USD, EUR, GBP, JPY,
    BRL, THB, AUD, CAD, and custom currencies. All economic modules
    update automatically.
  - Interactive Tool Overview -- Collapsible accordion on the Home page
    with clickable tool items that navigate directly to the relevant
    module.
  - Restructured Navbar -- Explicit, user-friendly labels with logical
    groupings (Convert, Survival Curves, Costs & Outcomes, Learn).
  - Five new pkgdown vignettes with worked examples.

                        Changes in version 1.3.0                        

New Features

  - HR Converter Module -- Convert Hazard Ratios to time-dependent
    transition probabilities; compare multiple HRs simultaneously.
  - Enhanced Output Panels -- Step-by-step explanations, rendered
    MathJax formulas, and literature citations on every output panel.
  - Batch HR Conversion -- CSV upload for bulk HR-based conversions
    alongside existing rate and odds batch modes.
  - pkgdown Documentation Site -- Hosted at
    https://drpakhare.github.io/ParCC/ with vignettes for all core
    workflows.

                        Changes in version 1.2.0                        

  - Initial public release with core converters, survival extrapolation,
    PSA distributions, financial tools, ICER/NMB, VBP, diagnostics, and
    Lab Notebook.