TwoDcDAPSA (version 0.1.0)
Calculate TwoDcDAPSA: PROs-Joint Contrast (PJC) Score and
Quartiles
Description
Provides a calculator for the two-dimensional clinical Disease Activity
index for Psoriatic Arthritis (TwoDcDAPSA), a principal component-derived measure
that complements the conventional clinical DAPSA score. The TwoDcDAPSA captures
residual variation in patient-reported outcomes (pain and patient global assessment)
and joint counts (swollen and tender) after adjusting for standardized cDAPSA using
natural spline coefficients derived from published models. Residuals are
standardized and combined with fixed principal component loadings to yield a
continuous PROs-Joint Contrast (PJC) score and quartile groupings. The package
applies pre-specified coefficients and loadings to new datasets but does not
estimate spline models or principal components itself.