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Milan Bouchet-Valat edited this page Nov 9, 2017 · 10 revisions

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.