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I am analysing a range of clinical outcomes for a drug treatment and need to compare the values pre and post treatment - I’m using excel to do this and have found that for most of my outcomes the data is not normally distributed. Sample size is 69 patients - as such id imagine I’m best presenting my results as median and IQR but just wondering what stat test is best to run? Doing this in excel.

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  • $\begingroup$ Depending on what’s the aim, a paired t-test or paired Wilcoxon test may be enough. $\endgroup$
    – utobi
    Sep 26, 2023 at 4:51

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Choose your test

I typically reference one of these. Save the ol' brain power for the programs.

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  • $\begingroup$ That chart fails to account for the fact that nonparametric methods and semiparametric (ordinal) regressions work great for quantitative Y. $\endgroup$ Sep 26, 2023 at 10:39
  • $\begingroup$ For the original question I'd use the rank difference test. $\endgroup$ Sep 26, 2023 at 10:40
  • $\begingroup$ Definitely, definitely agree with both of you. May I follow up with ad additional parametric/nonparametric flowchart? Or should I replace the first for the complete thought process? $\endgroup$ Sep 27, 2023 at 3:45
  • $\begingroup$ I recommend started a new chart that recognizes that an interval-scaled Y is also ordinal and that nonparametric/semiparametric methods are fully efficient. Semiparametric models can also estimate differences in means/quantiles. And models contain tests as special cases; separate tests not needed. See hbiostat.org/bbr/nonpar and fharrell.com/post/rpo $\endgroup$ Sep 27, 2023 at 11:16

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