added reasons for confusing null values

datacarpentry / spreadsheet-ecology-lesson

Data Organization in Spreadsheets for Ecologists

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Closed tracykteal closed 6 years ago

tracykteal commented 6 years ago

Addresses https://github.com/datacarpentry/spreadsheet-ecology-lesson/issues/45. Adding information about why there might be null values, and some suggestions for addressing those different reasons.

ErinBecker commented 6 years ago

Looks good, thanks @tracykteal!