n_dist,Studentmethod {blindrecalc}  R Documentation 
Distribution of the Sample Size
Description
Calculates the distribution of the total sample sizes of designs with blinded sample size recalculation for different values of the nuisance parameter or of n1.
Usage
## S4 method for signature 'Student'
n_dist(
design,
n1,
nuisance,
summary = TRUE,
plot = FALSE,
iters = 10000,
seed = NULL,
range = 0,
allocation = c("approximate", "exact"),
...
)
Arguments
design 
Object of class 
n1 
Either the sample size of the first stage (if

nuisance 
Value of the nuisance parameter. For the Student's ttest this is the variance. 
summary 
Is a summary of the sample size distribution desired? Otherwise, a vector with sample sizes is returned. 
plot 
Should a plot of the sample size distribution be drawn? 
iters 
Number of simulation iterations. 
seed 
Random seed for simulation. 
range 
determines how far the plot whiskers extend out from the box. If range is positive, the whiskers extend to the most extreme data point which is no more than range times the interquartile range from the box. A value of zero causes the whiskers to extend to the data extremes. 
allocation 
Whether the allocation ratio should be preserved
exactly ( 
... 
Further optional arguments. 
Details
The method is only vectorized in either nuisance
or n1
.
Value
Summary and/or plot of the sample size distribution for every nuisance parameter and every value of n1.
Examples
d < setupStudent(alpha = .025, beta = .2, r = 1, delta = 3.5, delta_NI = 0,
alternative = "greater", n_max = 156)
n_dist(d, n1 = 20, nuisance = 5.5, summary = TRUE, plot = FALSE, seed = 2020)