Harmonization summary
0 label-stable codes
- Label changes detected
- 1
- Multiple dataset contexts
- 0
- Unique codes
- 1
- Enriched codes in this report
- 0
Praxis Data Lab · Variable History
Variable history and harmonization report.
Review variable definitions, cycle chronology, survey design, laboratory methods, method-change boundaries, detection limits, and evidence-backed harmonization actions.
1matching variable codes
2 release records across 2 datasets and 2 cycles.
Search scope
Results for “DMDHRAGZ”
Scientific safeguard
Qualified assessment is authoritative; chronology remains supporting evidence.
Praxis separates source-stated method or instrument changes from automated differences in CDC/NCHS method text. The qualified harmonization assessment below is the researcher-facing conclusion; method chronology explains the underlying evidence and does not override that adjudication.
Variable-by-variable chronology
Qualified harmonization assessment and indexed evidence
Each variable first shows the current qualified assessment used by Study Builder, followed by cycle-specific source evidence and method chronology.
DMDHRAGZCompatible with harmonization
HH reference person's age in years
- Observed years
- 2017–2023
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2017-2018 → 2021-2023
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- HH reference person's age in years — 2017-2018
- HH ref person’s age in years — 2021-2023
Cycle-by-cycle release history
- 2017-2018: DEMO_J — HH reference person's age in years — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — HH ref person’s age in years — Demographic Variables and Sample Weights (Demographics)