sample_size {preference} | R Documentation |
Preference trial parameter accessors
Description
Accessor function have been created to get the sample size (sample_size), power (power), effect size (effect_size), arm proportion (proportion), significance (significance), and trial variance estimates (sigma2) for a set of preference trials.
Note that these methods are preferred over accessing the underlying data frame directly since the structure is slightly non-standard (some columns are lists) and some values, like power, are not stored directly.
Usage
sample_size(x)
## S3 method for class 'preference.trial'
sample_size(x)
power(x)
## S3 method for class 'preference.trial'
power(x)
effect_size(x)
## S3 method for class 'preference.trial'
effect_size(x)
proportion(x)
## S3 method for class 'preference.trial'
proportion(x)
significance(x)
## S3 method for class 'preference.trial'
significance(x)
sigma2(x)
## S3 method for class 'preference.trial'
sigma2(x)
Arguments
x |
the set of preference trials. |
Examples
# Create a set of trials with a sequence of preference effects.
trials <- preference.trial(pref_ss=100, pref_effect=seq(0.1, 2, by=0.5),
selection_ss=100, selection_effect=1,
treatment_ss=100, treatment_effect=1, sigma2=1,
pref_prop=0.6)
# the sample sizes
sample_size(trials)
# the powers
power(trials)
# the effect sizes
effect_size(trials)
# the arm proportions
proportion(trials)
# the significance
significance(trials)
# the variance estimates
sigma2(trials)
[Package preference version 1.1.6 Index]