front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |review

The method of triads is a technique for estimating the correlation between an observed measure of exposure and the true, but unknown, exposure value. The correlation in this case is referred to as the validity coefficient (VC). This technique was first applied by Dr. Rudolph Kaaks for use in validation studies in nutritional epidemiology. Application of the method of triads requires at least 3 measurements of the same exposure and assumes that all the 3 measurements are linearly related to the true exposure (T). First, we will briefly refer to continuous exposures and the associated measurement error.