English

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Etymology

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un- +‎ directional

Adjective

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undirectional (not comparable)

  1. Not directional.
    • 2015, Kang Li, Wei Zheng, Mingyao Ai, “Optimal designs for the proportional interference model”, in Annals of Statistics[1], volume 43, pages 1596–1616:
      Parallel studies are carried out for the undirectional model, where the neighbor effects do not depend on whether they are from the left or right.

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