Function to calculate the estimated sample size based on the Expected Value of Perfect Information (EVPI)

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Description

This function will provide the total sample size of your planned cost-effectiveness study. The optimal sample size of your planned cost-effectiveness study is reached when EVPIn (a vector calculated by the evpi_decrease object) is less or equal to (step_ref + step_exp)*cost_indiv

Usage

1
sample_size(object_evpi_decrease, cost_indiv)

Arguments

object_evpi_decrease

: evpi_decrease object. See create_object_evpi_decrease

cost_indiv

: cost of an additional inclusion in your planned cost-effectiveness study.

Value

A dataframe containing three vectors : N, N_exp, N_ref, the total number of subjects of your planned cost-effectiveness study, in the experimental group and in the reference group respectively.