How to compare data

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Sarah Yun
Sarah Yun 2020-1-20
评论： Star Strider 2020-1-20
Hello,
I have data for the size of rocks for two independent locations, A and B.
Data lists rock size from smallest to largest (shown by yellow column)
Red column shows the percentage of rocks under that size (out of 100%)
Green columns shows cumulative percentage (out of 100%)
**Normality test indicates rock data (yellow columns) is not normally distributed.**
**When I apply log transform to the data, it becomes normally distributed, and shows a straight (linear) line when plotted on a graph**
*I want to compare rock sizes between the two locations*
**What is the best way to compare rock sizes (yellow columns) given that these values are thresholds, not actual rock sizes?**

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Star Strider
Star Strider 2020-1-20
If they both have the same distribution (regardless of what that distribution is),and you are comparing two samples, the ranksum test is likely the most appropriate.
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Sarah Yun
Sarah Yun 2020-1-20
Thank you Star.
Is it possible to just do ranksum on the yellow column (the bins) for both data? Or would this violate a rule?
Star Strider
Star Strider 2020-1-20
My pleasure.
It would likely be more appropriate to use it on the red columns, since (as I understand it) those are the relative frequencies of the sizes.

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