Null Flavors - CDISC
1
Null Flavors
A tool for handling missing and awkward data
Presented by Diane Wold
? CDISC 2014
2
Outline
? Source ? ISO and HL7 Data Type Standard ? Null Flavor Hierarchy ? "Unknown" Null Flavors ? "Invalid" Null Flavors ? Null Flavors in the SDTM world ? Future Use of Null Flavors ? Why Null Flavors Now?
? CDISC 2014
Complex Data Types
? Data Types for Health Care
ISO 21090 HL7 R2 Data Types
? Complex data types have multiple components
Null flavor is a component that accompanies the "main" component of a data type.
The null flavor is populated when the main component is null, and provides a little information about that null main component
? Data type standard is expressed in xml
Easily handles as many components are as needed for any particular situation
? CDISC 2014
Null Flavor Component of a Complex Data Type
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