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
6 release records across 6 datasets and 6 cycles.
Search scope
Results for “ALQ140U”
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.
ALQ140UCompatible with harmonization
UNIT OF MEASURE.
- Observed years
- 1999–2010
- Release records
- 6
- Datasets
- 6
- 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: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- 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
- UNIT OF MEASURE. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 1999-2000: ALQ — UNIT OF MEASURE. — Alcohol Use (Questionnaire)
- 2001-2002: ALQ_B — UNIT OF MEASURE. — Alcohol Use (Questionnaire)
- 2003-2004: ALQ_C — UNIT OF MEASURE. — Alcohol Use (Questionnaire)
- 2005-2006: ALQ_D — UNIT OF MEASURE. — Alcohol Use (Questionnaire)
- 2007-2008: ALQ_E — UNIT OF MEASURE. — Alcohol Use (Questionnaire)
- 2009-2010: ALQ_F — UNIT OF MEASURE. — Alcohol Use (Questionnaire)