survsim - Stata development version history

This page details the version history of the development version of survsim, hosted on this website, which can be installed by typing in Stata,

net install survsim, from(https://www.mjcrowther.co.uk/code/survsim)

or updated by typing adoupdate survsim.

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24aug2020 version 4.0.4

• re-syncing with new predictms (multistate version 3.0.0) for merlin model simulation
• bug fix in missing value warning text; now fixed

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.