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Editorial
. 2011 Nov 1;589(Pt 21):5007-11.
doi: 10.1113/jphysiol.2011.221093.

Presenting data: can you follow a recipe?

Gordon B Drummond  1 , Brian D M Tom
Affiliations
Editorial

Presenting data: can you follow a recipe?

Gordon B Drummond et al. J Physiol. .
No abstract available

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Figures

Figure 1
Figure 1. Three comparisons between a control and a treatment group
In A, there is no significant difference. In B, the variations of the samples are less, and a smaller difference between the groups is now statistically significant but the difference is small and probably not biologically important. In C, the greater confidence limits are similar to those of B, but the difference is much greater, and probably important.
Figure 2
Figure 2. In the upper panel we show data samples taken from populations with different distributions
One sample is from a population with symmetrically distributed values; the other two samples are from a population with a skewed distribution. In the lower panel we can see that the mean values for these groups are very similar, but the SD calculated for the skewed sample is much greater. Using median and quartile values for a sample from a skewed population provides a better description of the data. When the skewed data are transformed into logarithms, the distribution becomes more symmetrical (right-hand axis).
See this image and copyright information in PMC

References

    1. Altman DG, Bland JM. Standard deviations and standard errors. Br Med J. 2005;331:903. - PMC - PubMed
    1. Curran-Everett D. Multiple comparisons: philosophies and illustrations. Am J Physiol Regul Integr Comp Physiol. 2000;279:R1–R8. - PubMed
    1. Drummond GB, Tom BDM. How can we tell if frogs jump further? J Physiol. 2011;589:3409–3413. - PMC - PubMed
    1. Lang TA, Secic M. How to Report Statistics in Medicine. Annotated Guidelines for Authors, Editors, and Reviewers. Philadelphia: American College of Physicians; 1997. A Note to the Reader; p. xi.
    1. Ludbrook J. Multiple comparison procedures updated. Clin Exp Pharmacol Physiol. 1998;25:1032–1037. - PubMed

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