Data intelligence · automation · analyticsA Praxis Global Institute platform
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.

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Your specification

4 research variables · 1 cycle

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Complete the study specification first.
  • ARXO2WD is not released for 1999-2000.
  • AUQ331 is not released for 1999-2000.
  • AADBDTIM is not released for 1999-2000.
AADBDTIMBed Vacuum Time (seconds)
ARXO2WDOCCIPUT-TO-WALL DISTANCE IN CENTIMETERS
AUQ331These next questions are about noise exposure at work. First we are going to ask about loud noise. Loud means so loud that {you/s/he} must speak in a raised voice to be heard by someone three feet away when not using hearing protection. After that we will ask about very loud noise. Very loud noise is noise that is so loud {you have/he has/she has} to shout in order to be understood by someone standing 3 feet away from {you/him/her} when not using hearing protection. {Have you/Has SP} ever had a job, or combination of jobs where {you were/s/he was} exposed to loud sounds or noise for 4 or more hours a day, several days a week? (Loud means so loud that {you/s/he} must speak in a raised voice to be heard.)
DCDINDEXLead - Dust

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
  • LAB20.XPT · 1999-2000 — selected variable: DCDINDEX

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.