# ParCC 1.4.0

## 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.

# ParCC 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.

# ParCC 1.2.0

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