TwoDcDAPSA: Calculate TwoDcDAPSA: PROs-Joint Contrast (PJC) and
Swollen–Tender Joints Contrast (STC) Scores and Quartiles
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. 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 two
continuous component scores: the PROs-Joint Contrast (PJC) and the
Swollen–Tender joints Contrast (STC), along with quartile-based groupings
(including optional combined quartile groupings). The package applies pre-specified
coefficients, residual standardization, and loadings to new datasets but does not
estimate spline models or principal components itself.
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