Analysis visR and ggsurvfit functionality

• Adding or using ADTTE data model for downstream processing

  • When no stratum is present, include 'Overall' inside the surv object for downstream processing (also update names attribute). Otherwise you always need to check if strata element is NULL which is annoying. I am OK to not show Overall in the legend since it should be mentioned in the title of the graph.
  • extract param / paramcd when present and put in x-label
  • remove NA in CNSR, AVAL, PARAM or variables used in the formula
  • include timepoint = 1

• Graph layout

  • Add legend title
  • add_annotation

• extra features

  • Lifetable
  • Interactive functionality
  • Improve UAT for validation/qualification purposes

Proposed Package Names (please add many more)

• survisr
• survCDISC
• I am fine with ggsurvfit