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🔬 '''Quasi-experiment''' is a research design used in insurance and [[Definition:Actuarial science | actuarial science]] to estimate causal effects when random assignment of policyholders, claimants, or other units to treatment and control groups is impractical, unethical, or commercially infeasible. Unlike a fully [[Definition:Randomized controlled trial (RCT) | randomized controlled trial]], a quasi-experiment exploits naturally occurring variation — such as a regulatory change that affected some jurisdictions but not others, a phased rollout of a new [[Definition:Claims management | claims process]], or an eligibility cutoff for a [[Definition:Policyholder | policyholder]] benefit — to construct a credible comparison between groups. In an industry where business constraints and [[Definition:Insurance regulation | regulatory requirements]] make true randomization rare, quasi-experimental methods have become essential to rigorous decision-making.

⚙️ Several families of techniques fall under the quasi-experimental umbrella, each suited to different data structures and institutional settings. [[Definition:Regression discontinuity design (RDD) | Regression discontinuity designs]] leverage sharp eligibility thresholds — for example, evaluating whether policyholders just above versus just below an age-based [[Definition:Premium | premium]] tier boundary exhibit different renewal behavior. [[Definition:Difference-in-differences (DiD) | Difference-in-differences]] approaches compare trends in a group exposed to an intervention (say, a new [[Definition:Fraud detection | fraud-screening]] protocol rolled out in one region) against trends in an unexposed group, netting out common time effects. [[Definition:Propensity score matching (PSM) | Propensity score matching]] constructs synthetic control groups from observational records. Across all these methods, the analyst's central challenge is to argue convincingly that, absent the intervention, the treated and comparison groups would have evolved similarly — an assumption that must be tested and defended, particularly when results inform [[Definition:Pricing | pricing]] models, [[Definition:Reserving | reserve]] adjustments, or regulatory filings.

💡 The practical value of quasi-experiments in insurance is growing as the industry accumulates richer datasets and faces heightened expectations for evidence-based management. Regulators in markets governed by [[Definition:Solvency II | Solvency II]], the [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]] framework, and Asia-Pacific supervisory regimes increasingly expect insurers to substantiate claims about the effectiveness of risk-mitigation programs, [[Definition:Underwriting | underwriting]] innovations, and consumer-facing interventions. [[Definition:Insurtech | Insurtech]] firms, too, rely on quasi-experimental evidence to demonstrate to carrier partners that their technology delivers measurable improvements in [[Definition:Loss ratio (L/R) | loss ratios]] or customer retention. Because the cost and disruption of full randomization often exceed what an insurer's operations can absorb, quasi-experiments occupy a pragmatic middle ground — more rigorous than simple before-and-after comparisons, yet feasible within the commercial realities of running a book of business.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Randomized controlled trial (RCT)]]
* [[Definition:Propensity score matching (PSM)]]
* [[Definition:Regression discontinuity design (RDD)]]
* [[Definition:Difference-in-differences (DiD)]]
* [[Definition:Selection bias]]
* [[Definition:Rubin causal model (RCM)]]
{{Div col end}}

Definition:Quasi-experiment - Revision history

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