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Milan Bouchet-Valat edited this page Nov 9, 2017
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Design references:
- SQL NULL on Wikipedia
- Missing Data Functionality in NumPy enhancement proposal, summary of discussions and wiki page (2011-2012)
- Working with missing data in the Pandas manual
- Pandas 2 Missing data consistency design document
- Missing Values in the SAS manual
- Missing Values in the EViews manual
- Missing Values in R, Stata, SAS and SPSS on UCLA's IDRE website
- Types of missing values (NullFlavor) in the Health Level 7 v3 standard.
- "Handling of missing values in statistical software packages for Windows" , a survey from 1999