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News: the Stata command

Source: vignettes/articles/stata-news.Rmd
stata-news.Rmd

The Stata command is a port of the R package and follows its releases; the version it ports is named in powerape version and in every power statement. The changes of the R package are listed in its news.

powerape for Stata 0.1.3 (2026-10-17)

  • Panel designs calibrate about as fast as in the R package. A panel powerape dgp, setape, setaie, trueape or trueaie at the default nint(1e5) took about a minute and now takes one to three seconds, so robustness sweeps over panel scenarios and mde searches, which recalibrate at every step, take seconds instead of minutes. Every result is bit-identical to 0.1.2.
  • The validation scripts run from a clone of the repository and are part of it; see How powerape is validated.

powerape for Stata 0.1.2 (2026-10-16)

  • Every simulation command (power, curve, n, mde, robust) prints a line beginning fit: that names who fitted the simulated studies, for example probit via engine(stata), effects(closed), cfprobit via engine(stata), effects(margins) or Mata engine (Fisher scoring), and stores it in r(fit), r(engine) and r(effects).
  • engine() and effects() given on a single command now apply to that command only. Before, they also changed the session default that powerape engine sets.

powerape for Stata 0.1.1 (2026-10-16)

  • Installation with net install (powerape.pkg, stata.toc), and powerape version, which checks that the command and its Mata library belong together.
  • Declared for Stata 16 or later (frames). The control-function route under the default engine uses cfprobit (Stata 18 or later).
  • separation(keep) under engine(stata): replications with an empty identifying cell are fitted with asis and kept, as R’s glm keeps them.
  • effects(margins) for the interaction effect on the control-function route: margins, dydx() at() after cfprobit, with the control function held fixed.

powerape for Stata 0.1.0 (2026-10-15)

  • First release: a port of the R package powerape 1.11.3 with every route (parametric, pilot data, fitted pilot model, panel, control function), estimand (APE and AIE), claim and search of the R package. Validated against the R package in four tiers; see How powerape is validated.