Yule's coefficient of association Q is calculated using frequencies from a:
A. Time series data
B. 2×2 contingency table for two binary attributes
C. Frequency distribution table
D. Scatter plot
Answer: Option B
Solution (By JKSSB Mock Tests)
Yule's Q = [(AB)(αβ) - (Aβ)(αB)] / [(AB)(αβ) + (Aβ)(αB)], requiring the four cell frequencies of a 2×2 table cross-classifying two dichotomous attributes.
Explanation:
Weighted harmonic mean = Σw / Σ(w/x), ideal for averaging rates or ratios (e.g., price per unit) when the weights correspond to the denominators (e.g., quantities), ensuring correct aggregation.
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