Ecologic fallacy refers to which concept?

Ecologic fallacy refers to which concept?

• A. Assessing exposure in large groups rather than in many small groups
• B. Assessing outcome in large groups rather than in many small groups
• C. Ascribing the characteristics of a group to every individual in that group
• D. Examining correlations of exposure and outcomes rather than time trends

Answer: (C)

The main idea is that you cannot infer what an individual is like from what a group as a whole is like. Ecologic fallacy happens when you take characteristics observed for a group and attribute them to every person within that group. For example, if a city or region has a high average income, it doesn’t mean every resident is wealthy; within that area there are people with both higher and lower incomes. Similarly, a region with a high average smoking rate doesn’t mean every person there smokes. The error lies in applying group-level patterns to individuals. The other options describe analyzing data at the group level (a feature of ecological studies) or focusing on time trends, which aren’t about misapplying group data to individuals.

The main idea is that you cannot infer what an individual is like from what a group as a whole is like. Ecologic fallacy happens when you take characteristics observed for a group and attribute them to every person within that group. For example, if a city or region has a high average income, it doesn’t mean every resident is wealthy; within that area there are people with both higher and lower incomes. Similarly, a region with a high average smoking rate doesn’t mean every person there smokes. The error lies in applying group-level patterns to individuals.

The other options describe analyzing data at the group level (a feature of ecological studies) or focusing on time trends, which aren’t about misapplying group data to individuals.