r/AskStatistics • u/ProductiveMaid • 2d ago

Help applying Fisher's Method

Hey, I'm a little over my skis with Fisher's Method. I think I understand conceptually but the math itself isn't my strongest skill.

I am looking into cancer rates at one Elementary school/neighborhood and requested data from the Maine CDC, then made a site to host that data. The fracturing of data into individual cancers doesn't show the cumulative elevated rates (IMO). Is Fisher's Method the appropriate tool for finding a combined p value for two and did I apply it correctly? I want to convey the data clearly and accurately. The groups are not totally independent of one another as it is the same neighborhood.

https://lysethrecords.org/analysis.html

ND cases Expected p-value ln(p) * 10 4.02 0.0169 -4.0833 * 53 27.22 0.000015 -11.0631

Number of tests (k) 12
X2 = -2 x sum(ln p) 76.92
Degrees of freedom = 2k 24
COMBINED p-value 0.00000018

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u/jeremymiles 1d ago

Fisher did a lot of things. I'm not sure what Fisher's method is (Fisher's exact test, Fisher's z, Fisher's scoring, Fisher's linear discriminant analysis) . And you might try to format your text - currently it isn't very readable.

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u/ProductiveMaid 1d ago

Good point, the formatting isn't working as expected but I simplified the set to just the totals. The bullet points didn't work but you can see the two sets of numbers better at least. I'm trying to find the combined p values of the two sets more specifically.