NEWS.md

In ldbounds: Lan-DeMets Method for Group Sequential Boundaries

ldbounds 2.0.1

• Bug fixes

ldbounds 2.0.0

• Print Methods

  • Created print.ldBounds: almost identical to summary (just leaves off the exit probabilities)

  • Created print.ldPower: almost identical to summary (just leaves off the exit probs, and puts the lower/upper probs up with the boundaries, instead of separating)

  • Edited summary.ldPower: to give power when drift is known (put space before probs table)

• Better two-sided bounds and defaults rather than weird parameters

  • Created sides argument for ldBounds

  • Added ability to specify the number of looks, which then automatically creates equally spaced analysis times

  • Sides=2, but with only one alpha, etc, creates symmetric bounds, splitting the provided alpha in half for each, upper and lower bounds

  • Print and summary functions updated to account for this

• ldPower to use output from ldBounds

  • ldPower can now accept an ldBounds object as the first argument, in which case, it does not require za, zb, t, t2

  • Defaults to drift=0 when nothing is specified

• Nominal alpha level at each look provided (for one-sided or symmetric bounds)

  • ldBounds now has additional value: nominal alpha at each look.

  • Summary.ldBounds displays this

• asf changed from asf/alpha to asf

  • asf now uses just asf rather than asf alpha (this was only a change to alphas function)

• Weird integer errors

  • ldBounds and alphas now have checks that take into account floats

• Ability to specify non-alpha spending boundaries

  • Created new function commonbounds to calculate Pocock or O{'}Brien-Fleming (non-alpha-spending) bounds at equally spaced times.

  • These also become ldBounds objects

  • Adjusted print and summary functions to accommodate

• Calculate adjusted p-values

  • Added p-value functionality to ldPower function; stepwise and likelihood ratio ordering available.

  • Uses a new adj.p function which, ironically, calls ldPower.

  • Edited printing and summary functions to use this as well.

• Graphics

  • Now uses base graphics, very simple

  • Option to show on either z-value or b-value scale

  • Ability to add to existing plot

• Conditional power

  • Added condpower, a function to calculate simple conditional power

ldbounds documentation built on March 31, 2023, 5:16 p.m.