VAR_INMB_DIFF: A Reference Class to represent the variance of the...

In EBASS: Sample Size Calculation Method for Cost-Effectiveness Studies Based on Expected Value of Perfect Information

Description

The variance of the Incremental Net Monetary Benefit may also be calculated in a hypothetical situation when the standard deviation of costs and effectiveness in each group differ.

Fields

sdc_ref

: standard deviation of costs in the reference group

sdc_exp

: standard deviation of costs in the experimental group

sde_exp

: standard deviation of effectiveness in the experimental group

sde_ref

: standard deviation of effectiveness in the reference group

rho

: coefficient of correlation between the difference in costs (dc) and the difference in effectiveness (de)

object_lambda

: object containing the ceiling cost-effectiveness ratio or maximum acceptable cost of a unit of effectiveness. See create_object_lambda

See Also

create_object_var_inmb_direct to directly provide a value for the variance of the Incremental Net Monetary Benefit

create_object_var_inmb to calculate the theoretical standard deviation of the expected INB with the same standard deviation in the reference and the experimental group

create_object_var_inmb_diff the constructor

set_sdc_ref(sdc_ref):

sets the standard deviation of costs in the reference group of this VAR_INMB_DIFF object

set_sdc_exp(sdc_exp):

sets the standard deviation of costs in the experimental group of this VAR_INMB_DIFF object

set_sde_exp(sde_exp):

sets the standard deviation of effectiveness in the experimental group of this VAR_INMB_DIFF object

set_sde_ref(sde_ref):

sets the standard deviation of effectiveness in the reference group of this VAR_INMB_DIFF object

set_rho(rho):

Sets the coefficient of correlation between the difference in costs (dc) and the difference in effectiveness (de) of this VAR_INMB_DIFF object

set_lambda(lambda):

sets the lambda value of this VAR_INMB_DIFF object

get_var_inmb():

Return the calculated variance of the Incremental Net Monetary Benefit when the standard deviation of costs and effectiveness in each group differ.

Examples

## First, create a lambda object
object_lambda <- create_object_lambda (20000)
## Then, create a var_inmb_diff object
var_inmb_diff <- create_object_var_inmb_diff(sdc_ref=2100, sdc_exp=2100, sde_ref = 0.12,
sde_exp = 0.12, rho = 0.1,object_lambda = object_lambda)

EBASS documentation built on May 1, 2019, 6:54 p.m.