NEWS.md

In survdistr: Survival Distribution Container with Flexible Interpolation Methods

survdistr 0.0.3

• Improved documentation
• Refactored interp_cif()
• Added trapezoidal integration option for continuous hazard/density to survival conversion in convert_to_surv()
• Renamed argument: trim_duplicates to trim_dups

survdistr 0.0.2

• Added convert_to_surv() for efficient transformation of hazard/density functions to survival at anchor time points (uses C++ internally).
• Introduced trim_duplicates() to remove repeated S(t) values across the time axis, with tolerance.
• Added interp_cif() for constant interpolation of CIF (uses C++ internally).
• Added extract_times() to consistently obtain and validate time points from vectors or matrices.
• Unified assertion functions into one: assert_prob().
• Unified mat_interp() and vec_interp() into a single interp() function.
• Enhanced interp():
• Added aliases for the three interpolation options (e.g., const_haz is equivalent to exp_surv).
• Implemented S(t) interpolation in C++ for all 3 options (output = "surv"); H(t) and F(t) follow similarly.
• Implemented f(t) interpolation in C++ for all 3 options (output = "density")
• Implemented h(t) interpolation in C++ for all 3 options (output = "hazard")
• Requires unique and ordered eval_times, resulting in significant C++ speed-up.
• Allows passing times separately to preserve precision.
• Improved survDistr:
• Removed data_type argument; input now only S(t).
• Added aliases for the three interpolation options.
• Allows passing times during construction separately for precision.
• Introduced filter() method for in-place object filtering.
• Added rows argument to filter input matrix before interpolation without altering the object.
• method and times are now active fields, not public members.
• Added S3 conversion via as_survDistr(x).
• Added unit tests for all features.

survdistr 0.0.1

• Base survDistr class.
• assert_prob_matrix() for asserting survival, CDF and CIF matrices.
• mat_interp() and vec_interp() for constant and linear interpolation of survival, CDF and CIF matrices/vectors (using internal Rcpp methods).

survdistr documentation built on April 9, 2026, 5:09 p.m.