Changelog • ParCC

ParCC 1.4.0

CRAN release: 2026-03-30

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).

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.

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).

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.

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.

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