Harmonization summary
1 label-stable codes
- Label changes detected
- 0
- 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 “ALQ290”
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.
ALQ290Compatible with harmonization
During the past 12 months, about how often did {you/SP} have 12 or more drinks in a single day?
- Observed years
- 2017–2020
- Release records
- 2
- Datasets
- 2
- Components
- Questionnaire
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 → 2017-2020
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- During the past 12 months, about how often did {you/SP} have 12 or more drinks in a single day? — 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2017-2018: ALQ_J — During the past 12 months, about how often did {you/SP} have 12 or more drinks in a single day? — Alcohol Use (Questionnaire)
- 2017-2020: P_ALQ — During the past 12 months, about how often did {you/SP} have 12 or more drinks in a single day? — Alcohol Use (Questionnaire)