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PJCcalculator  

PROs-Joint Contrast (PJC) Calculator
View on CRAN: Click here


Download and install PJCcalculator package within the R console
Install from CRAN:
install.packages("PJCcalculator")

Install from Github:
library("remotes")
install_github("cran/PJCcalculator")

Install by package version:
library("remotes")
install_version("PJCcalculator", "0.1.3")



Attach the package and use:
library("PJCcalculator")
Maintained by
Ning Meng
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2025-09-21
Latest Update: 2025-09-21
Description:
Computes the Patient-Reported Outcomes (PROs) Joint Contrast (PJC), a residual-based summary that captures information left over after accounting for the clinical Disease Activity index for Psoriatic Arthritis (cDAPSA). PROs (pain and patient global assessment) and joint counts (swollen and tender) are standardized, then each component is adjusted for standardized cDAPSA using natural spline coefficients that were derived from previously published models. The resulting residuals are standardized and combined using fixed principal component loadings, to yield a continuous PJC score and quartile groupings. This package provides a calculator for applying those published coefficients to new datasets; it does not itself estimate spline models or principal components.
How to cite:
Ning Meng (2025). PJCcalculator: PROs-Joint Contrast (PJC) Calculator. R package version 0.1.3, https://cran.r-project.org/web/packages/PJCcalculator. Accessed 06 Aug. 2026.
Previous versions and publish date:
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