Calculating The RDA
The equations used to calculate the RDA are as follows:
"If the standard deviation (SD) of the EAR is available and the requirement for the nutrient is symmetrically distributed, the RDA is set at two SDs above the EAR:
RDA = EAR + 2 SD(EAR).
If data about variability in requirements are insufficient to calculate an SD, a coefficient of variation (CV) for the EAR of 10 percent is assumed, unless available data indicate a greater variation in requirements. If 10 percent is assumed to be the CV, then twice that amount when added to the EAR is defined as equal to the RDA. The resulting equation for the RDA is then
RDA = 1.2 × EAR.
This level of intake statistically represents 97.5 percent of the requirements of the population."
Read more about this topic: Dietary Reference Intake
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