The present study was a randomized experiment
comparing traditional lectures to a self-directed learning approach that involved replacing all lectures with free student study time and the availability of weekly question-answer session with the course coordinator.
For example, when well-specified causal hypotheses can be formulated and randomization to treatment and control conditions is ethical and feasible, a randomized experiment
is the best method for estimating effects" (Feuer, Towne, Shavelson, 2002, p.
This is a study that is intended to provide convincing evidence and is normally a randomized experiment
However, the Panel was clear in stating that "when well-specified causal hypotheses can be formulated and randomization to treatment and control conditions is ethical and feasible, a randomized experiment
is the best method for estimating effects" (Feuer et al.
5) The best control group is constructed using a randomized experiment
And in a randomized experiment
in Akron, Ohio involving clients of a public health clinic, a small monetary incentive (the gift of a lottery ticket) increased immunization rates more than patient reminders or increased "off-hours" availability [Yokley and Glenwick 1984].
Department of Education, this randomized experiment
requires that half the students in select districts throughout the State use the Carnegie Learning program, and half continue using the districts' existing Algebra I courses over a two-year period.
She discusses the different types of validity that make evaluation conclusions defensible; the concept of internal validity; three basic research designs used to assess causal claims about program impact (the randomized experiment
, the quasi experiment, and the nonexperiment), their variations, and statistical models that can be used to analyze their data; survey sampling and questionnaire construction; and meta-analysis.
Evidence from a Randomized Experiment
with the Rajasthan Police"
at the University of Oregon in Eugene, studied 1,400 employees in a randomized experiment
to find out how they responded to different presentations of quality and cost information.
Using Rogers' diffusion of innovation model, the researchers designed a randomized experiment
in 12 hospitals.
For example, in 1997 Mexico began a randomized experiment
called Progresa in more than 24,000 households in 506 villages.