n1 R Documentation

## Query sample size of a design

### Description

Methods to access the stage-one, stage-two, or overall sample size of a `TwoStageDesign`. `n1` returns the first-stage sample size of a design, `n2` the stage-two sample size conditional on the stage-one test statistic and `n` the overall sample size `n1 + n2`. Internally, objects of the class `TwoStageDesign` allow non-natural, real sample sizes to allow smooth optimization (cf. `minimize` for details). The optional argument `round` allows to switch between the internal real representation and a rounded version (rounding to the next positive integer).

### Usage

``````n1(d, ...)

## S4 method for signature 'TwoStageDesign'
n1(d, round = TRUE, ...)

n2(d, x1, ...)

## S4 method for signature 'TwoStageDesign,numeric'
n2(d, x1, round = TRUE, ...)

n(d, x1, ...)

## S4 method for signature 'TwoStageDesign,numeric'
n(d, x1, round = TRUE, ...)

## S4 method for signature 'GroupSequentialDesign,numeric'
n2(d, x1, round = TRUE, ...)

## S4 method for signature 'OneStageDesign,numeric'
n2(d, x1, ...)
``````

### Arguments

 `d` design `...` further optional arguments `round` `logical` should sample sizes be rounded to next integer? `x1` stage-one test statistic

### Value

sample size value of design `d` at point `x1`

`TwoStageDesign`, see `c2` for accessing the critical values

### Examples

``````design <- TwoStageDesign(
n1    = 25,
c1f   = 0,
c1e   = 2.5,
n2    = 50,
c2    = 1.96,
order = 7L
)

n1(design) # 25
design@n1 # 25

n(design, x1 = 2.2) # 75

``````

adoptr documentation built on June 22, 2024, 9:21 a.m.