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- W147733431 abstract "In vitro experiments need to be well designed and correctly analysed if they are to achieve their full potential to replace the use of animals in research. An experiment is a procedure for collecting scientific data in order to answer a hypothesis, or to provide material for generating new hypotheses, and differs from a survey because the scientist has control over the treatments that can be applied. Most experiments can be classified into one of a few formal designs, the most common being completely randomised, and randomised block designs. These are quite common with in vitro experiments, which are often replicated in time. Some experiments involve a single independent (treatment) variable, while other factorial designs simultaneously vary two or more independent variables, such as drug treatment and cell line. Factorial designs often provide additional information at little extra cost. Experiments need to be carefully planned to avoid bias, be powerful yet simple, provide for a valid statistical analysis and, in some cases, have a wide range of applicability. Virtually all experiments need some sort of statistical analysis in order to take account of biological variation among the experimental subjects. Parametric methods using the t test or analysis of variance are usually more powerful than non-parametric methods, provided the underlying assumptions of normality of the residuals and equal variances are approximately valid. The statistical analyses of data from a completely randomised design, and from a randomised-block design are demonstrated in Appendices 1 and 2, and methods of determining sample size are discussed in Appendix 3. Appendix 4 gives a checklist for authors submitting papers to ATLA." @default.
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- W147733431 date "2001-07-01" @default.
- W147733431 modified "2023-10-14" @default.
- W147733431 title "Guidelines for the Design and Statistical Analysis of Experiments in Papers Submitted to<i>ATLA</i>" @default.
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- W147733431 doi "https://doi.org/10.1177/026119290102900409" @default.
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