FPC

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



    Population Size        FPC Check:                       Step 1:     Initial calculation:
         Males             initial n ≥10% ?                                    n=     3.8416 * ( 0.5          * (1- 0.5 )) =         384.16
    15-24                          no                                                            0.05           * 0.05
    25-34                          no
    35-44                          no                       Step 2:     Complete the population table to the left to check if the Finite Population
    45-54                          no                                   Correction (FPC) can be applied. If the initial n calculated above is 10% or
    55-64                          no                                   more of the size of the majority of the age groups, then the FPC can be
        Females                                                         applied. If the FPC can be applied, continue calculating your sample size on
    15-24                            no                                 the FPC worksheet. If the FPC cannot be applied continue to Step 3 below.
    25-34                            no
    35-44                            no                     Step 3:     Multiply by the design effect and number of age-sex estimates:
    45-54                            no
    55-64                            no                                         n=     384.16     *     1.5      *      8    = 4609.92

                                                            Step 4:     Adjust for expected non-response to get your final sample size:

                                                                                n= 4609.92         /    0.8    =    5762.4
                                                                                                              FINAL SAMPLE SIZE
Instructions: This worksheet is only to be used if the Finite
Population Correction is applicable (i.e. the target population
is very small). Complete the population table in the lower left
corner of the START worksheet to confirm if the FPC is
applicable for your target population.                            Step 2:   Apply FPC to sample size for e
                                                                            n 's together (see table to the lef
                                   Intitial n
      Population Size          (calculated on      n after FPC
          Males              START worksheet)        applied      Step 3:   Now, multiply the adjusted n v
      15-24           0           384.16               0.00
      25-34           0           384.16               0.00                       n=
      35-44           0           384.16               0.00
      45-54           0           384.16               0.00       Step 4:   Finally, adjust for expected non
      55-64           0           384.16               0.00
         Females                                                                  n=
      15-24           0           384.16               0.00
      25-34           0           384.16               0.00
      35-44           0           384.16               0.00
      45-54           0           384.16               0.00
      55-64           0           384.16               0.00
                    Sum of n for all estimates:        0.00
Apply FPC to sample size for each estimate and sum these adjusted
n 's together (see table to the left).


Now, multiply the adjusted n values by the design effect:

             0.00    *   1.5       =           0

Finally, adjust for expected non-response:

             0.00    /   0.8       =    0
                               FINAL SAMPLE SIZE

				
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posted:5/7/2013
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