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Praxis Data Lab

Your Study Package

Review your Study Package before checkout.

This is the study you assembled. Confirm the selected variables, cycles, exact source files, automatic survey fields, and deliverables before proceeding to payment.

A research team reviewing results together around a laptop

Your specification

4 research variables · 1 cycle

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Complete the study specification first.
  • AADBDTIM is not released for 1999-2000.
  • ARXO2WD is not released for 1999-2000.
  • ARDDINEX is not released for 1999-2000.
AADBDTIMBed Vacuum Time (seconds)
ARDDINEXMEASURED DIFFERENCE IN CHEST CIRCUMFERENCE, INSPIRATION MINUS EXHALATION (IN CM)
ARXO2WDOCCIPUT-TO-WALL DISTANCE IN CENTIMETERS
AUAEXSTSStatus of an Audiometry Exam

Cycles: 1999-2000

Up to 50 researcher-selected variables per one-time package.

Source files for your study

Exact CDC/NCHS inputs selected for this specification

These are the source files Praxis will use for the variables and cycles shown above. They replace any generic sample-study file list.

  • DEMO.XPT · 1999-2000 — demographics, linkage, eligibility, weights and survey design
  • AUX1.XPT · 1999-2000 — selected variable: AUAEXSTS

Included automatically · no limit charge

Survey-ready foundations

  • SEQN participant identifier
  • NHANES cycle indicator
  • Eligibility fields
  • Appropriate sample weight
  • Survey strata
  • Survey PSU

Complete delivery

Reproducible files, not just a data export

  • Cleaned CSV, Parquet, and Excel outputs
  • Original CDC/NCHS source files and checksums
  • Codebook, harmonization record, and provenance
  • README, validation summary, and analysis specification
  • R and Python starter code

Preparation normally takes 5–10 minutes; please allow up to 15 minutes. You can leave after payment and return through My Study Packages, and we’ll email your secure download link when it is ready.