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

INDFMIN2

Compatible with harmonizationmoderate confidence

Demographics

Total family income (reported as a range value in dollars)

Source releases: 6
Available cycles: 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Dataset: Demographic Variables & Sample Weights

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: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018

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

RIDRETH3

Compatiblehigh confidence

Demographics

Recode of reported race and Hispanic origin information, with Non-Hispanic Asian Category

Source releases: 18
Available cycles: 2011-2012 · 2011-2012 · 2011-2012 · 2011-2012 · 2011-2012 · 2013-2014 · 2013-2014 · 2013-2014 · 2013-2014 · 2013-2014 · 2015-2016 · 2015-2016 · 2015-2016 · 2015-2016 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset: Demographic Variables & Sample Weights

RIDRETH3 was introduced in 2011-2012 as an expanded race/Hispanic-origin recode that distinguishes Non-Hispanic Asian participants following the revised NHANES sampling design. It is a stable construct within its released era, but it is not simply a renamed RIDRETH1.

Evidence provenance: CDC/NCHS source-confirmed evidence · Praxis deterministic adjudication

Evidence signals: source-stated

Praxis harmonization actions

Pool RIDRETH3 within 2011-2012 and later calibrated cycles when the expanded categories are analytically appropriate. Treat RIDRETH1 and RIDRETH3 as parallel construct variants; use an explicit common recode when combining analyses across their differing category schemes.

Supporting CDC/NCHS evidence

Remove from study Variable history CDC source