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I have a set of data, the structure is as follows:

        5mg 10mg  15mg  20mg
Survive 15   22   18    24
death   3    2    3     2

I divided the patients into 4 groups by medication dose: 5mg, 10mg, 15mg, 20mg, the outcome indicator is survival, should the grouping variable be a rank variable or an unordered variable? And should I use the Chi-square test or Fisher test or Kruskal-Wallis test?

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