Formula For Calculating Sample Size For Cross Sectional Study. You need the following parameters. If the DEFF and average number per cluster are provided the ICC is calculated using the formula ICCDEFF-1k-1.
If the ICC is provided the DEFF at an arbitrary average of 30 observations per cluster is calculated as. It is very important to understand that different study design need different method of sample size calculation and one formula cannot be used in all designs. Dr Azmi Mohd Tamil 2012 Calculate Manually Calculate using these formulas Fleiss JL.
Sample size using formula in Kelsey et al Methods in Observational Epidemiology 2nd Edition Table 12-15.
For comparative cross sectional study you need to use Double proportion formula to calculate the sample size. It is very important to understand that different study design need different method of sample size calculation and one formula cannot be used in all designs. Sample Size for Cross-Sectional. 5 Percent of Exposed with Outcome.
