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Fix koan 

Fixes #204
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hadley 2016-07-28 15:40:34 -05:00
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@ -354,7 +354,7 @@ There are two missing values in this dataset:
* The return for the first quarter of 2016 is implicitly missing, because it
simply does not appear in the dataset.
One way to think about the difference is with this Zen-like koan: An implicit missing value is the presence of an absence; an explicit missing value is the absence of a presence.
One way to think about the difference is with this Zen-like koan: An explicit missing value is the presence of an absence; an implicit missing value is the absence of a presence.
The way that a dataset is represented can make implicit values explicit. For example, we can make the implicit missing value explicit putting years in the columns: