[R] Quantiles with ordered categories

[matthias-gondan at gmx.de]

Dear R users,

This works: 

quantile(1:10, probs=0.5)

This fails (obviously):

quantile(factor(1:10), probs=0.5)

But why do quantiles for ordered factors not work either?

quantile(ordered(1:10), probs=0.5)

Is it because interpolation (see the optional type argument) is not defined? Is there an elegant workaround?

Thank you.

Best wishes,

Matthias

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