Q Function (disambiguation)

Q Function may refer to:

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  Q-function (radar/communications)

  The Q-function, a standard way to express tail probabilities of the normal distribution used in detection and communications performance analysis.

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  Q-function (reinforcement learning)

  The action-value function Q(s, a) that estimates the expected return in reinforcement learning.

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  Q-function (mathematical statistics/normal tail)

  A closely related statistical notation for the right-tail probability of a distribution (often the standard normal), used in hypothesis testing and probability.