var_loa: Variance of limits of agreement

In ikoenemund/blandxtr: Advanced Bland Altman analysis for method comparison

Description

var_loa returns variance of limits of agreement (LoA) based on a method proposed by Bland and Altman (1999).

Usage

var_loa(n, n_obs, bsv, wsv, output_subjects, var_var_d, bias_alt, beta)

Arguments

n	number of subjects
n_obs	number of observations
bsv	between-subject variance
wsv	within-subject variance
output_subjects	data.table containing subject ID and number of measurements of each subject (m_i)
var_var_d	variance of the variance of mean of all differences
bias_alt	set TRUE for alternative calculation of bias (small within-subject variance) and its variance, set FALSE for standard calculation of bias (small between-subjects variance) and its variance
beta	for 100*(1-beta)%-confidence interval around bias

Value

var_loa variance of limits of agreement

se_d standard error of bias

Note

Function calculates other variables as well (but does not return the,)

• ev_var_d expected value of variance of all differences

• var_bias variance of mean of all differences

• var_sd_d variance of the standard deviation of the differences

Author(s)

Inga Koenemund [e-mail]

ikoenemund/blandxtr documentation built on June 13, 2019, 8:53 p.m.