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  between the binary row and column variables is indicated by the
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  between the binary row and column variables is indicated by the
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  tendency of diagonally opposite cells in one direction to differ in
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  tendency of diagonally opposite cells in one direction to differ in
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  size from those in the other direction; color is used to show this
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  size from those in the other direction; color is used to show this
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  direction.  Confidence rings for the odds ratio allow a visual test of
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  direction.  Confidence rings for the odds ratio allow a visual test of
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  the null of no association; the rings for adjacent quadrants overlap
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  the null of no association; the rings for adjacent quadrants overlap
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  iff the observed counts are consistent with the null hypothesis.
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  if and only if the observed counts are consistent with the null hypothesis.
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  Typically, the number \eqn{k} corresponds to the number of levels of a
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  Typically, the number \eqn{k} corresponds to the number of levels of a
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  stratifying variable, and it is of interest to see whether the
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  stratifying variable, and it is of interest to see whether the
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  association is homogeneous across strata.  The fourfold display
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  association is homogeneous across strata.  The fourfold display
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  visualizes the pattern of association.  Note that the confidence rings
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  visualizes the pattern of association.  Note that the confidence rings