In some surveys, the middle value is much more chosen than in some other cases, a phenomenon called a ‘moderacy effect’. The example below shows a different between a regular unimodal curve (light grey-Australia) and a curve that present a moderacy effect (dark grey-Croatia). We define a Five-Over-Six ratio (FOS ratio); a given curve presents a moderacy effect if and only if the FOS ratio is superior to one.
We explore this phenomenon from a cross-sectional perspective. Frequency of occurence are presented below.