RWE Methods · Comparative Effectiveness
Comparative Effectiveness Research
Comparative effectiveness research (CER) compares treatments as they are used in real practice, to show which works better, for whom, and at what value.
CER and the real-world methods behind it are central to the agenda at RWE Connect 2026 in Boston.
Free. Instant download. No obligation.
The approaches
Approaches to Comparative Effectiveness Research
CER draws on several designs, each suited to a different question and data situation. These are the main approaches.
The distinction
Effectiveness vs Efficacy
CER answers a different question from a classic explanatory trial. One asks what can work; the other asks what does work.
Efficacy (Explanatory Trials)
- Controlled, ideal conditions
- Narrow, selected patients
- Strong internal validity
- Answers: can it work?
Effectiveness (CER)
- Routine, real-world conditions
- Broad, representative patients
- Strong external validity
- Answers: does it work in practice?
CER often uses real-world data, so it relies on careful design and methods to reduce bias. See observational studies for the designs behind it.
How it works
How a CER Study Works
Good comparative effectiveness research follows a disciplined path from question to decision.
Getting it right
Keeping CER Reliable
Because CER often compares treatments in observational data, its credibility rests on the methods that keep bias out.
The impact
What CER Informs
Comparative effectiveness evidence shapes decisions across the healthcare system.
The direction of travel
Where CER Is Heading in 2026
CER is being reshaped by better methods and richer data. These are the shifts to watch, and debates on the agenda at RWE Connect 2026.
Who is in the room
Who Attends RWE Connect 2026
A senior, focused audience of the people who design and commission comparative studies.
Seniority is confirmed: 150+ attendees, around 60% at Director or VP level and above. The functional mix shown is indicative; confirmed registration splits are shared with sponsors from the live delegate list.
Explore
Explore Related Methods
Comparative effectiveness research sits within a wider RWE methods toolkit.
Sponsor RWE Connect 2026
Meet the Evidence and Methods Buyers in Boston
The teams that design and commission comparative studies gather at RWE Connect 2026: 150+ attendees, around 60% at Director or VP level and above.
RWE Connect 2026
Get the RWE Study Methods Primer
A plain-English guide to the core real-world evidence methods, including comparative effectiveness. See the methods, then meet the people applying them in Boston.
- The core RWE study designs
- How to keep comparisons reliable
- Where the methods are heading in 2026
Free. Instant download. No obligation.
Comparative Effectiveness Research: Common Questions
What is comparative effectiveness research?
Comparative effectiveness research (CER) compares the benefits and harms of different treatments as they are used in real practice, to show which works better, for whom, and at what value.
What is the difference between efficacy and effectiveness?
Efficacy is whether a treatment can work under ideal, controlled trial conditions. Effectiveness is whether it does work in routine, real-world practice. CER focuses on effectiveness.
How is CER different from a randomized controlled trial?
A randomized trial tests efficacy under controlled conditions. CER often uses real-world data and observational or pragmatic designs to compare treatments as they are actually used, relying on methods to reduce bias.
What methods are used in CER?
Pragmatic randomized trials, observational cohort studies, target trial emulation, network meta-analysis, external control arms and registry-based comparisons.
What is target trial emulation?
Target trial emulation designs an observational study to mimic the randomized trial you would ideally run, specifying eligibility, treatment strategies and outcomes up front to reduce bias.
How do you control for confounding in CER?
Through new-user active-comparator designs, propensity score methods, target trial emulation, sensitivity analyses and negative controls, supported by fit-for-purpose data.
What is network meta-analysis?
Network meta-analysis compares multiple treatments indirectly by combining evidence from many trials, even when they were not compared head to head.
Is CER accepted by regulators and payers?
Yes. CER informs regulatory, HTA and payer decisions when the study design, methods and underlying data are fit for the question, within the FDA real-world evidence framework.
What data is used for comparative effectiveness research?
Electronic health records, administrative claims, registries and linked real-world data, alongside pragmatic trial data, chosen to fit the comparison being made.
Who uses comparative effectiveness research?
Regulators, HTA bodies and payers, clinical guideline developers, and pharmaceutical HEOR and medical teams use CER to decide which treatment delivers better outcomes and value.
What is RWE Connect 2026?
RWE Connect 2026 is a two-day real-world evidence summit in Boston bringing together the RWE, HEOR and methods leaders who generate and apply real-world evidence, with 40+ speakers and 150+ attendees.
When and where is RWE Connect 2026?
14 to 15 October 2026 at the Hampton Inn by Hilton, Boston Seaport District, Boston, MA.
