experimental design


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Related to experimental design: scientific method

design

 [de-zīn´]
a strategy that directs a researcher in planning and implementing a study in a way that is most likely to achieve the intended goal.
case study design an investigation strategy involving extensive exploration of a single unit of study, which may be a person, family, group, community, or institution, or a very small number of subjects who are examined intensively. The number of variables is usually very large.
cohort design longitudinal design.
cross-sectional design a research strategy in which one or more group(s) of subjects are studied at one given point in time.
experimental design a research design that eliminates all factors that influence outcome except for the cause being studied (independent variable). All other factors are controlled by randomization, investigator-controlled manipulation of the independent variable, and control of the study situation by the investigator, including the use of control groups.
longitudinal design a research strategy in which one or more group(s) of subjects in various stages of development are examined simultaneously with the intent of inferring trends over time. The assumption is that the phenomenon under study progresses with time. Called also cohort design.
methodological design a process used to develop the validity and reliability of instruments to measure constructs used as variables in research.
nonequivalent control group design a study design in which the control group is not selected by random means.
partial correlation design a design developed to eliminate the influence of a third variable on a relational pattern by holding it constant mathematically, so that the magnitude of the relationship between the two remaining variables can be determined.
path analysis design a design to determine the accuracy of a theoretical model: a hypothesized causal model is developed from the theoretical model and the major variables within it are measured and relationships among them determined; regression analysis is used to determine whether the data are consistent with the model.
survey design a design in which data are collected with questionnaires or through personal interviews with members of an identified population.
time dimensional design an investigation strategy for the examination of sequence and patterns of change, growth, or trends across time; see also prospective study and retrospective study.
trend design a research strategy to examine changes in the general population in relation to a particular phenomenon by means of data collected at predetermined intervals of time from different samples selected from the general population.

experimental design

[eksper′imen′təl]
Etymology: L, experimentum + designare, to mark out
(in research) a study design used to test cause-and-effect relationships between variables. The classic experimental design specifies an experimental group and a control group. The independent variable is administered to the experimental group and not to the control group, and both groups are measured on the same dependent variable. Subsequent experimental designs have used more groups and more measurements over longer periods. True experiments must have control, randomization, and manipulation.

ex·per·i·men·tal de·sign

(eks-per'i-men'tăl dĕ-zīn')
research a study design used to test cause and effect relationships between variables.

experimental

emanating from or pertaining to experiment.

experimental animals
animals kept expressly for the purposes of conducting experiments on them. Called also laboratory animals.
experimental design
the method of allocating experimental units to treatment groups in an experiment; many complicated and sophisticated designs are available, e.g. balanced, unbalanced, crossover, factorial, randomized, non-random, split-plot.
experimental epidemiology
the study of changes effected in populations by changes made in the factors affecting their performance, behavior or health.
experimental model
experiment carried out using a model of a real system which contains some of the risk factors which apply in the real state; the model is a simplification of real life.
experimental study
a study in which all of the risk factors are under the direct control of the investigator.
References in periodicals archive ?
sliced), a third experimental design compared specimens consisting of a 2.
A key problem is that the use of experimental designs calls for various conceptual and pragmatic trade-offs that cannot be ignored.
If the student's design differs from those already created (forbid the thought), existing data sets may be modified quickly to match the student's experimental design.
Application of experimental design and artificial neural networks to separation and determination of active components in traditional Chinese medicinal preparations by capillary electrophoresis, Chromatographia 55 (9-10), 579-583 (2002).
The authors of the "gold standard" editorial, applauding the experimental design, recognized the extent that the Hutchinson study exceeded previous efforts to apply the standards of linear scientific rigor to social interventions.
The strength and uniqueness of this software program is that it adapts statistical computations encountered in experimental design situations to a spreadsheet.
Howard Bloom, an economist at New York University, calls such experimental design "the most powerful existing methodology for measuring the impacts of social programs.
Their main discontent appears to be once more related to the experimental design in a number of cited behavioral studies.
You can use an experimental design to run all seven factors in eight runs and have the same standard error of the difference, thus saving you 7/8 of your runs.
Highlighting the guiding role of statistical principles in experimental design construction, coverage includes designs containing one or multiple factors, designs with at least one blocking factor, split-unit designs and their variations, supersaturated and Plackett-Burman designs.
Chi Square Test of Significance, Part II: Experimental Design Chapter 15.

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