simtrial 0.4.2

Statistical improvements

• Summary function of sim_gs_n() is available (#268, thanks to @LittleBeannie).
• The denominator of the milestone test Z-score is corrected (#270, thanks to @LittleBeannie).
• Statistical information is added as output of sim_gs_n() (#273, thanks to @LittleBeannie).
• The randomization ratio is built as an attribute of sim_pw_surv() and passed into the wlr() test (#281, #285 thanks to @LittleBeannie and @jdblischak).
• The sign of the Z-score is unified to positive numbers (#272, #286, thanks to @LittleBeannie and @jdblischak).

Computational improvements

• The source code of summary() is rewritten from tibble or data.frame to data.table, which is optimized to use as little memory as possible by avoiding making unnecessary temporary copies of data frames. This results in code that is more efficient in both time and memory use. (#289, thanks to @jdblischak).
• The sim_fixed_n() function has been updated to allow parallel simulations (#249, #252, #253, #262, thanks to @cmansch and @jdblischak).

Bug fixes

• Fixed the bug of cut functions in parallel (#261, thanks to @cmansch).

Coding improvements

• The wlr() function is enhanced to S3 generic to accept both counting process and time-to-event data as its input (#276, #277, thanks to @jdblischak).

Documentation

• Use KaTeX for pkgdown math rendering (#263, thanks to @nanxstats).

Tests

• Regression tests of summary() is added (#282, thanks to @jdblischak).

simtrial v0.4.1

Improvements

• Pass noSuggests checks by running code examples, tests, and vignettes
  conditionally if the Suggests dependencies are not installed (#243, thanks, @nanxstats).

simtrial 0.4.0

New features

• rmst() introduces the RMST test (#188, thanks, @LittleBeannie).
• milestone() introduces the milestone test (#199, #204, #211, #237, thanks, @LittleBeannie).
• sim_gs_n() provides an experimental implementation for fixed sample size group sequential design simulation, with unit tests upcoming
  (#195, #201, #208, #212, thanks, @LittleBeannie and @jdblischak).
• create_cut() allows users to create custom interim and final analyses cuttings based on their specific requirements (#201, #221, thanks, @jdblischak).
• create_test() enables users to create various testing approaches for interim and final analyses (#215, #221, thanks, @jdblischak).
• multitest() gives users the option to perform multiple tests on a simulated dataset (#215, thanks, @jdblischak). Note: This function is still experimental and may be improved in future releases, as it was created prior to the standardization of test functions in #227.
• Test outputs (logrank, weighted logrank, RMST, milestone, MaxCombo) are now unified as a list including method, parameter, estimate, se, z-value, and p-value (#227, thanks, @LittleBeannie).

Bug fixes

• Fixed incorrect weights generated by early_zero() under stratified designs (#233, thanks, @LittleBeannie).

Documentation

• Enhanced documentation for get_analysis_date() (#186, thanks, @LittleBeannie).

Dependency

• Removed dependency on the bshazard package as it was archived by CRAN (#234, thanks, @nanxstats).

simtrial 0.3.2

This release makes minor improvements on auxiliary code with side-effects.

Improvements

• Remove the code that sets options() within vignette("modest-wlrt").
• Updated the code used for generating image assets. These scripts now write to tempdir() instead of the package directory.

simtrial 0.3.1

This release introduces significant changes to the API, improves simulation performance substantially, and adds new features and documentation.

Significant user-visible changes

• Complete overhaul of the API. Function and argument names now use snake case for consistency and readability. See the function reference for the updated naming scheme. Detailed change history is available in the merged pull requests (thanks, @LittleBeannie, @lili-ling-msd, and @XintongLi2023).
• Dataset names updated to snake case (thanks, @nanxstats, #164).
• The base pipe operator is now used throughout the package. The magrittr pipe is no longer re-exported (thanks, @nanxstats, #146).

Improvements

• Rewritten table backend for simtrial functions using data.table, achieving a 3x to 5x speedup compared to the previous implementation (thanks, @jdblischak, #111).
• sim_fixed_n() now utilizes the %dofuture% operator for parallelization, enhancing flexibility and reproducibility (thanks, @cmansch, #110).
• rpwexp() adopts the inverse CDF method for random number generation, with the naive methods now as internal functions (thanks, @jianxiaoyang, #15 and #174).
• sim_fixed_n() is optimized to skip Breslow's method in the absence of ties (thanks, @jdblischak, #130).
• The internal function for computing Z statistics in Fleming-Harrington weighted logrank tests is now named wlr_z_stat() (thanks, @elong0527, #105).

New features

• early_zero_weight() is added as a weighting function for early data removal (thanks, @LittleBeannie, #123).
• get_analysis_date() is added to calculate interim/final analysis dates under various conditions (thanks, @LittleBeannie, #122).

Documentation

• New vignette("workflow") providing an overview of data manipulations involved in TTE simulations (thanks, @keaven, #99).
• New vignette("parallel") demonstrating the parallelization workflow and coding best practices (thanks, @cmansch, #113 and #134).

Miscellaneous

• Added a hex sticker logo with a generative art design for the package (thanks, @keaven, #158).

simtrial 0.2.2

This is the version that enabled parallel computation in simfix.

simtrial 0.2.1

This version supports the Biometrical Journal paper "A unified framework for weighted parametric group sequential design (WPGSD)" by Keaven M. Anderson, Zifang Guo, Jing Zhao, and Linda Z. Sun.