Econometric models are not considered an experimental method in economics. They are statistical techniques used to analyze economic data and make inferences about economic relationships.

Participants in laboratory experiments can be recruited from the general population, a specific population of interest, or university students, depending on the research question and the resources available.

Field experiments are conducted in a natural setting, where participants are observed in their everyday lives.

Natural experiments occur when researchers observe a naturally occurring change in the independent variable and then study the effects of this change on the dependent variable.

Randomized controlled trials are not typically used in economics, as they are more common in medical research.

In a between-subjects design, participants are randomly assigned to different treatments, so that the effects of the treatments can be compared.

In a within-subjects design, participants receive all of the treatments, so that the effects of the treatments can be compared within each participant.

A factorial design is used to study the effects of multiple independent variables on a single dependent variable.

Experiments are not a method for measuring economic outcomes, but rather a method for studying the effects of different treatments on economic outcomes.

Surveys are commonly used in experiments to collect data on participants' preferences, behavior, and demographics.

Observational data is collected in a natural setting, where participants are observed in their everyday lives.

Administrative data can be collected by government agencies, businesses, and researchers.

Matched control groups are not typically used in experiments, as they are more common in observational studies.

A no-treatment control group is used to compare the effects of a treatment to the effects of no treatment.

A placebo control group is used to compare the effects of a treatment to the effects of a placebo.

An active control group is used to compare the effects of a treatment to the effects of another treatment.