Praxis Data Lab · Study Builder

Build your NHANES study with harmonization intelligence.

Combine variables from the indexed Continuous NHANES catalog, choose the cycles you need, and see how Praxis connects source history, methods, cycle boundaries, and cross-code lineage into a study-specific harmonization view.

2variables selected

Praxis harmonization guidance available

Praxis found harmonization conditions for this study and has surfaced them below with the supporting source evidence.

2 variable assessments

ALQ170

Compatible with harmonizationmoderate confidence

Questionnaire

Considering all types of alcoholic beverages, during the past 30 days, how many times did you have {5/4} or more drinks on an occasion?

Source releases: 3
Available cycles: 2017-2018 · 2017-2020 · 2021-2023
Dataset: Alcohol Use

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

Evidence signals: source-derived · automated-difference

Relevant boundaries: 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023

Praxis harmonization actions

Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Confirm that the construct and coding are unchanged before pooling or recoding.

Supporting CDC/NCHS evidence

Remove from study Variable history CDC source

DCDSTAT