Direct popular vote index

Question: To what extent is the direct popular vote utilized? Clarification: Direct popular voting refers here to an institutionalized process by which citizens of a region or country register their choice or opinion on specific issues through a ballot. It is intended to embrace initiatives, referendums, and plebiscites, as those terms are usually understood. It captures some aspects of the more general concept of direct democracy at the national level. The term does not encompass recall elections, deliberative assemblies, or settings in which the vote is not secret or the purview is restricted. Likewise, it does not apply to elections for representatives. Scale: Interval, from low to high (0-1).