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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

5 research variables · 1 cycle

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Complete the study specification first.
  • ARXO2WD is not released for 1999-2000.
  • SIAPROXY is not released for 1999-2000.
  • ARD026D is not released for 1999-2000.
ARD026DHow often did {you/SP} get LOW BACK pain, aching or stiffness? Did {you/SP} have it…
ARXO2WDOCCIPUT-TO-WALL DISTANCE IN CENTIMETERS
DCDINDEXLead - Dust
SDMVPSUMasked Variance Unit Pseudo-PSU variable for variance estimation
SIAPROXYWas a Proxy respondent used in conducting the Sample Person (SP) interview?

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 — selected variable: SDMVPSU
  • 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.