. Author manuscript; available in PMC: 2023 Jun 5.

Published in final edited form as: J Infect Dis. 2014 Nov 1;210(Suppl 1):S341–S346. doi: 10.1093/infdis/jiu162

Table 1.

Parameters for Multithreshold C-LQAS for the 6-Cluster and 16-Cluster Samples

Classification^a		6-Cluster Sample (SD = 10%)^a	16-Cluster Sample (SD = 19%)^a
Good Accepted at 90%	No. of missed children	0–3	0–7
	α	24%	14%
	β	−13%	…^b
Intermediate Accepted at 80% but not at 90%	No. of missed children	4–8	8–22
	α	19%	14%
	β	−21%	20%
Poor Accepted at 60% but not at 80%	No. of missed children	9–19	23–48
	α	16%	5%
	β	−35%	4%
Very Poor Not accepted at 60%	No. of missed children	20+	49+

Abbreviations: α, probability of type I error (probability that an area with coverage below the lower threshold is accepted); β, probability of type II error (probability that an area with coverage above the upper threshold is not accepted); C-LQAS, cluster lot quality assurance sampling; GPEI, Global Polio Eradication Initiative; No., number; SD, standard deviation; UT, upper threshold.

The 16-cluster sample assumes a between-cluster SD of 19%, and parameter values are computed by simulation using a beta distribution. A 10% SD is assumed for the 6-cluster sample, and parameter values are consistent with the standard GPEI methodology.

β could not be simulated for UT = 98% and SD = 19%. For UT = 95%, β = 0.49.