This is really a beginner question. I have to perform a statistical analysis which is exactly the same as the one conducted in the table shown in the picture. Specifically, how to calcolate the positive/negative association within each type of bacteria, with the p-value? What method should I use? Is this a correlation? Is this a Fisher Exact Test? enter image description here

  • $\begingroup$ What part of the description in the paper are you having difficulty understanding? What are the terms the author(s) use(s) to describe the analysis? $\endgroup$
    – Sycorax
    Commented Oct 24, 2014 at 23:45
  • $\begingroup$ Please provide a link to the full paper. $\endgroup$
    – Prometheus
    Commented Oct 24, 2014 at 23:45
  • $\begingroup$ I don't understand how the p-value for the single group (bold numbers) have been calculated. The paper is "Population structure, virulence potential and antibiotic susceptibility of uropathogenic Escherichia coli from Northwest England", I don't think there is an open access version. $\endgroup$
    – Vaaal
    Commented Oct 25, 2014 at 0:00
  • $\begingroup$ Paper is here and is open access. $\endgroup$
    – Glen_b
    Commented Oct 25, 2014 at 14:14

1 Answer 1


The paper clearly states the following:

Statistical analysis

Unless otherwise stated, statistical analyses were performed using Fisher's exact test with a threshold for statistical significance of P < 0.05.

  • 1
    $\begingroup$ From my understanding of the Fisher's exact test, at the end we obtain ONE p-value. How to calculate the significance of the single group, as done by those authors (bold numbers)? $\endgroup$
    – Vaaal
    Commented Oct 25, 2014 at 0:02
  • $\begingroup$ @Vaaal that's another question altogether, Prometheus' answer is correct. $\endgroup$
    – Firebug
    Commented Sep 19, 2016 at 17:29

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