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Which of the following represents the Tetrad equation as given by Spearman ?

  • A.\(r_{12} \times r_{34} = r_{14} \times r_{23}\)
  • B.\(r_{13} \times r_{24} = r_{14} \times r_{23}\)
  • C.\(r_{14} \times r_{23} = r_{13} \times r_{24}\)
  • D.All of these

Answer: D

Spearman's tetrad equation says that the tetrad difference is zero when a single general factor accounts for the correlations among the four tests. The three possible pairings give equivalent equations: r12 times r34 equals r13 times r24, r12 times r34 equals r14 times r23, and r13 times r24 equals r14 times r23. The options given are forms of these, equal to each other in the single factor case, so each of the three represents the equation and the answer is 'all of these'.

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