The function statistics.raplot calculates the reclassification metrics. Used by CI.raplot.
Arguments
- x1
Either a logistic regression fitted using glm (base package) or lrm (rms package) or calculated probabilities (eg through a logistic regression model) of the baseline model. Must be between 0 & 1
- x2
Either a logistic regression fitted using glm (base package) or lrm (rms package) or calculated probabilities (eg through a logistic regression model) of the new (alternative) model. Must be between 0 & 1
- y
Binary of outcome of interest. Must be 0 or 1 (if fitted models are provided this is extracted from the fit which for an rms fit must have x = TRUE, y = TRUE).
- t
The risk threshold(s) for groups. eg t<-c(0,0.1,1) is a two group scenario with a threshold of 0.1 & t<-c(0,0.1,0.3,1) is a three group scenario with thresholds at 0.1 and 0.3. Nb. If no t is provided it defaults to a single threshold at the prevalence of the cohort.
- NRI_return
Flag to return NRI metrics, default is FALSE.