What is a fixed sample panel design?

A fixed sample panel design refers to a research methodology in which data is collected from the same individuals, or panelists, at multiple points in time. This approach allows researchers to track changes in attitudes, behaviors, or other characteristics of the same group, providing insights into trends and longitudinal effects. By utilizing the same sample across different time periods, the fixed sample panel design enhances the reliability of the data collected, as it controls for the variability that can arise from differences between individuals in each round of data collection.

This design is particularly valuable in understanding how specific factors influence a consistent group over time, allowing for detailed comparisons and analyses of individual-level changes. It contrasts with designs that involve different individuals in each round or a single point of data collection, which would not capture the dynamics of change within the same subjects. As a result, the fixed sample panel design is instrumental in longitudinal studies and market research where tracking changes in the same demographic is crucial for valid and actionable insights.