survsim - Stata version history

25may2020 version 4.0.3

  • efficiency of _msm improved
  • bug fix: Stata variables in user-defined hazard functions not parsed correctly; now fixed

30mar2020 version 4.0.2

  • bug fix; missing value issue when t = 0 internally, now fixed
  • bug fix; indexing issue occurred in varied circumstances, now fixed

29mar2020 version 4.0.1

  • bug fix; error in distribution(gompertz) when specified in a hazard#(), now fixed
  • help file edits

26mar2020 version 4.0.0

  • computation time reduced by about 70% for multi-state model simulation
  • reset added to hazard#() for semi-Markov models
  • syntax changed for user-defined functions, #t now {t} for more robust parsing
  • support for general multiple timescales, including:
    • {t0} can be used in user() and tdefunction() for time of entry into initial state for associated transition
  • cr subclass removed, now part of general msm syntax
  • bug fix; variables used directly in user() with a multi-state model were not passed to Mata -> now fixed
  • bug fix; if the same variable was used in multiple hazard#()s, parsing would only pick up the first -> now fixed

24mar2020 version 3.1.0

  • general Markov multi-state simulation now added
  • transmatrix() option added
  • tolerance changed to 0 from 1e-08 in mm_root()

21mar2020 version 3.0.0

  • complete re-write of core code
  • can now simulate from a fitted merlin survival model
  • can now simulate from cause-specific hazards competing risks models, with either parametric or user-defined hazard functions, with a new syntax
  • distribution() now required for parameteric models
  • ltruncated() added, can be a number or varname, synced with all except merlin model simulation
  • maxtime() can now be a number or a varname
  • help files completely re-written
  • added error report on missing values when general algorithm used
  • parsing made more robust

18dec2013 version 2.0.3

  • tde() with logcumhazard() or cumhazard() caused an error. Now fixed.

10oct2013 version 2.0.2

  • bug fix -> exact option added to confirm vars

08jul2013 version 2.0.1

  • minor bug fix in mixture model

04jan2013 version 2.0.0

  • maxtime() added to specify maximum generated survival time and event indicator
  • n() removed so must set obs
  • loghazard() and hazard() added for user-defined hazard functions, simulated using quadrature and root finding
  • default centol() changed to 1E-08
  • varnames can now appear in loghazard()/hazard() allowing time-dependent covariates
  • mixture model now uses Brent’s method -> much more reliable than NR, and allows tde()s
  • cumhazard() and logcumhazard() now added which just use root finding

15Nov2011 version 1.1.2

  • Fixed bug when generating covariate tempvars with competing risks.

20sep2011 version 1.1.1

  • Exponential distribution added.

10sep2011 version 1.1.0

  • Added Gompertz distribution. Time-dependent effects available for all models except mixture. showerror option added.

09sep2011 version 1.0.1

  • Time dependent effects now allowed for standard Weibull.

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