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Figure 1 | BMC Medical Research Methodology

Figure 1

From: Tracking type specific prevalence of human Papillomavirus in cervical pre-cancer: a novel sampling strategy

Figure 1

Graphical representation of the truncated sequential sampling plan. Classifications of high and low prevalence are based on breaching the upper or lower stop lines after the starting sample size (N min ) has been collected. Sampling continues when the proportion of the sample positive for an HPV type falls between the lines. A classification of moderate prevalence is made and sampling is stopped (truncated) when the maximum sample size (N max ) has been collected.

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