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Sample Size Calculator

Instructions: Complete the fields in green with the necessary information. Then read through the steps below to attain your final sample size.

Level of Confidence Measure 1.96 Describes the level of uncertainty in the sample mean or prevalence as an estimate of the population mean or prevalence. Recommended value: 1.96 (for 95% confidence level)
Margin of Error (MOE) 0.05 The expected half-width of the confidence interval. The smaller the margin of error, the larger the sample size needed. Recommended value: 0.05 (for small baseline levels, e.g. <.10, a smaller MOE of 0.02 or 0.01 is appropriate)
Baseline levels of the indicators 0.5 The estimated prevalence of the risk factors within the target population. Values closest to 50% are the most conservative. Recommended value: 0.5 if no previous data on population, else value closest to 0.5 from previous data
Design effect (Deff) 1.5 Describes the loss of sampling efficiency due to using a complex sample design. A value of 1.0 is appropriate for simple random samples.Recommended value: 1.5 (for most STEPS surveys)
Expected Response Rate 0.8 The anticipated response rate. Recommended value: enter response rate from previous national/subnational household surveys, else use 0.8 as an estimate
Number of age/sex Estimates 8 The number of age-sex groups for which estimates will be calculated. If age-sex estimates are desired for specific states/regions/island, multiply the number of age-sex groups by the number of states/regions/islands to attain the total number of estimates desired.

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