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Peer reviewedDennis, Michael L. – Evaluation Review, 1990
Six potential problems with the use of randomized experiments to evaluate programs in the field are addressed. Problems include treatment dilution, treatment contamination or confounding, inaccurate case flow and power estimates, violations of the random assignment processes, changes in the environmental context, and changes in the treatment…
Descriptors: Drug Rehabilitation, Evaluation Problems, Experiments, Field Studies
Peer reviewedDunford, Franklyn W. – Evaluation and Program Planning, 1990
Seven qualitative issues associated with randomization that have the potential to weaken or destroy otherwise sound experimental designs are reviewed and illustrated via actual field experiments. Issue areas include ethics and legality, liability risks, manipulation of randomized outcomes, hidden bias, design intrusiveness, case flow, and…
Descriptors: Ethics, Experiments, Field Studies, Legal Problems
Peer reviewedLennox, Richard D.; Dennis, Michael L. – Evaluation and Program Planning, 1994
Potential methods are explored for removing or otherwise controlling random measurement error, assessment artifacts, irrelevant variation in outcome measures, and confounding sources of covariation in a structural equations model. Using examples with measures of quality of life and functioning, the authors consider these methods for field…
Descriptors: Error of Measurement, Field Studies, Measurement Techniques, Models
Tallmadge, G. Kasten – 1991
Problems with conducting randomized field experiments in education are explored. Focus is on problems encountered while evaluating a group of dropout prevention projects. Project planners were asked to manipulate the subject eligibility criteria until they identified as eligible three to four times as many students as they could serve. They were…
Descriptors: Attrition (Research Studies), Control Groups, Dropout Programs, Educational Experiments
Download full textNational Inst. of Education (DHEW), Washington, DC. – 1973
The first of this document's three major sections describes the history and rationale behind legislative and executive action that led to the creation of NIE. The second section outlines the tentative status of the four major program planning efforts at NIE. These programs are (1) the visiting scholars program; (2) the basic studies program, which…
Descriptors: Educational Change, Educational Development, Educational Planning, Educational Practices
Lipe, Dewey; Haveman, Jacqueline E. – 1977
Issues associated with the evaluation of 61 educational curriculum units, which was conducted by the American Institutes for Research (AIR) are described. The units were adapted to the AIR Career Education Curriculum framework by creating 133 instructional units within which students could develop career skills in an orderly sequence. The…
Descriptors: Career Education, Curriculum Development, Curriculum Evaluation, Data Analysis
