experimental design

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Related to experimental design: scientific method


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

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.


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 ?
We scaffolded the instruction of experimental design in both sections in the first 2 weeks of lab, but included a "guided inquiry" lab in the third week only in the experimental section to give students an opportunity to apply their skills.
The judicious selection of a logical sequence of good experimental designs leads to a useful model that can produce an optimized process for a cost-effective product that will pay for itself over its lifetime.
Since Taguchi's experimental design has the capacity to be carried out in an industrial scale and it is cost-effective, the execution of this project by using the proposed method can be the key to the project's success," she underlined.
Custom procedural consultation and experimental design for maximum testing efficiency and sensitivity based on individual practices.
Table 5 presents the analysis of variance (ANOVA) results for the first experimental design, which considered the effects of the thickness of a sawn face component and the density of the fiberboard (MDF or HDF) substrate on cupping deformation in EWF.
Perhaps one of the most debated issues in experimental design is the trade-off between internal validity and external validity.
If a student submits an experimental design which is inappropriate or incomplete, the teacher should generate the corresponding data for the student.
Guerin reviewed statistical experimental design, a technique for experimentation that allows the investigator to simultaneously determine the effects of several factors on the output of a process or the properties of a product.
Presentations on NVH/ride will include, "In-vehicle noise study of the effect of four experimental design tires"; "An approach to the prediction of radiated tire noise using FEM and BEM"; "Transient response simulation of an off-road motorcycle with conventional and multi-cell tire inflation mechanisms"; and "Reducing tire-induced noise and vibration.
The by-products of their highly experimental design processes are fascinating, although perhaps more appealing to designers and artists who use similarly archaic techniques.
Significant progress on scientific problems previously considered intractable has been made through the combined use of intelligent, scientifically based experimental design, high efficiency methods and a underlying informatics system.
The software facilitates experimental design, execution, and analysis in a way very similar to a researcher's natural way of working.

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