Final answer:
VEP measures are advantageous over VAP because they provide a more accurate reflection of eligible voters, leading to a precise calculation of voter turnout rates.
Step-by-step explanation:
VEP measures of turnout may have an advantage over VAP measures because VEP, or Voting Eligible Population, provides a more accurate representation of the actual pool of individuals who are legally allowed to vote. Statisticians calculate VEP by taking the VAP, Voting Age Population, and subtracting those who are ineligible to vote, such as noncitizens and, in some US states, convicted felons. This leads to a more precise calculation of voter turnout rates by focusing on those who have the potential to participate in elections.
Campaigns and political parties prefer to target likely voters and use VEP to get a realistic idea of turnout. This is because VEP excludes groups known not to vote due to legal restrictions or other factors. As a result, VEP turnout rates are often considered more indicative of the electorate's political engagement and the legitimacy of the election process.