On the Interpretation of χ2 from Contingency Tables, and the Calculation of P

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Trend analysis of climate time series: A review of methods (2019, background): “The concept of degrees of freedom was introduced by Fisher (1922).”
A measurement of the Higgs boson mass in the diphoton decay channel (2020, neutral): “For each family of functions, a Fisher test [20] is performed to determine the maximum order to be used in the ﬁt, while the minimum order is determined by placing a requirement on the goodness of the ﬁt to the data.”
Who Makes Trends? Understanding Demographic Biases in Crowdsourced Recommendations (2017, methodology): “…then to evaluate whether the proportion of men and women among the promoters of t is signiﬁcantly different from their proportion in overall population, we ﬁrst build the following Contingency Table Then, we compute the p-value from this contingency table using Fisher’s test (Fisher 1922).”
Systematic integration of biomedical knowledge prioritizes drugs for repurposing (2017, neutral): “We used a Fisher’s exact test ( Fisher, 1922 ) to identify pairs of terms that occurred together more than would be expected by chance in their respective corpus.”