n1 {adoptr} | R Documentation |
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).
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, ...)
d |
design |
... |
further optional arguments |
round |
|
x1 |
stage-one test statistic |
TwoStageDesign
, see c2
for accessing
the critical values
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