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.

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.
References in periodicals archive ?
The experimental design was evaluated and approved by the technical council of the Institute of Clinical Research "Dr.
Six studies recommended future research in experimental design investigate long-term knowledge retention of subjects exposed to treatments (Baker et al., 2014; Bunch et al., 2014; Myers & Dyer, 2006; Pennington et al., 2015; Sapp & Thoron, 2014; Wagler, et al., 2008).
Defining the experimental unit correctly is crucial for proper experimental design and statistical analysis.
Since the experimental design method is very sensitive to local minimum, this approach solves this problem by creating turbulence in the search space.
To overcome the above mentioned limitations, optimization of both signal intensity (expressed as chromatographic peak areas) and repeatability (expressed as the coefficient of variation, CV%, of each peak area across replications of the same experiment) was carried out here by experimental design. Three main factors underwent optimization: temperature and time of extraction and the ionic strength, expressed as amount of salt added to the sample.
Then, using the methodology for experimental design that is mentioned above, the ranges of the parameters required to obtain optimum conditions were determined.
Anwar Ahmad explained the training comprised experimental design and data analysis, writing proposals adding that it is valuable for the teachers to gain more research projects in a befitting manner.
In order to determine whether students had prior knowledge or any misconceptions about the scientific method and experimental design, a pretest comprising 30 multiple-choice questions was administered to both sections (Appendix and Table 1).
The journalist David Brinkley once said "A successful man is one who can lay a firm foundation with the bricks others have thrown at him." In science and engineering, a good experimental design is the key to a successful product, as well as understanding a process.
Summary: TEHRAN (FNA)- Researchers at Iran's University of Mazandaran optimized a number of parameters effective in the synthesis of ZSM-5 nanozeolite by using Taguchi's experimental design.
Fully developed experimental design accompanies the package, allowing one to establish feedback relationships that maintain your process within the confines of proven acceptable ranges.

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