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.|