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Panel Survey
A longitudinal survey design that repeatedly interviews the same specific set of respondents (a panel) across multiple waves, allowing precise measurement of individual-level change but requiring ongoing tracking and management of panel attrition.
In Plain English
A panel survey is the most direct implementation of the longitudinal survey idea: you recruit a specific set of respondents, the panel, and go back to interview those exact same people again and again over time, month after month, or year after year. This gives researchers the cleanest possible view of how individuals genuinely change, since every respondent serves as their own comparison point across waves, but it demands ongoing effort to track down and retain the same people wave after wave, and inevitably loses some panel members along the way to relocation, disinterest, or death, attrition that needs careful monitoring and correction to keep the panel's later waves representative.
Definition
A panel survey repeatedly interviews the same specific set of respondents, the panel, at successive waves over time, in contrast to repeated cross-sectional surveys, which draw a fresh, independent sample at each wave, and to rotating panel designs, which only partially retain the same respondents across a fixed number of waves before permanent rotation. Because the exact same individuals are observed at each wave, panel surveys support the most direct and precise measurement of individual-level change available among survey designs, and enable fixed-effects and other within-person analytical approaches that difference out any time-invariant characteristics of each respondent; the central ongoing challenge of panel survey management is attrition, panel members are progressively lost across waves through relocation, refusal, death, or simple loss of contact, requiring both active retention efforts (tracking respondent contact information, incentive strategies) and, at the analysis stage, methods (such as attrition weighting or sensitivity analysis) to assess and correct for the risk that surviving panel members no longer represent the panel's original composition.
Properties
- Panel surveys enable within-person (fixed-effects) analytical methods that difference out any time-invariant characteristic of each respondent, comparing each person only to their own earlier responses, a powerful tool for controlling for unmeasured, stable confounders that no cross-sectional design, however cleverly analyzed, could replicate.
- Panel attrition compounds over successive waves, later waves of a long-running panel survey typically retain a smaller and potentially less representative subset of the original sample than earlier waves, which is why panel survey documentation typically reports cumulative retention rates and why attrition-adjusted weights become increasingly important as a panel ages.
- Panel conditioning, the phenomenon where repeated interviewing itself changes how respondents answer over time (becoming more practiced, more attentive, or more self-conscious about a topic simply from having been asked about it before), is a distinct measurement concern specific to panel surveys that neither cross-sectional nor rotating panel designs with less frequent re-interviewing face to the same degree.
At a Glance