Editing Contingency table (section)

=== Uncertainty coefficient ===
{{Main|Uncertainty coefficient}}
The [[uncertainty coefficient]], or Theil's U, is another measure for variables at the nominal level. Its values range from &minus;1.0 (100% negative association, or perfect inversion) to +1.0 (100% positive association, or perfect agreement). A value of 0.0 indicates the absence of association.

Also, the uncertainty coefficient is conditional and an asymmetrical measure of association, which can be expressed as
:<math>
U(X|Y) \neq U(Y|X)
</math>.
This asymmetrical property can lead to insights not as evident in symmetrical measures of association.<ref>{{Cite web|url=https://towardsdatascience.com/the-search-for-categorical-correlation-a1cf7f1888c9|title = The Search for Categorical Correlation|date = 26 December 2019}}</ref>