CourseWare Table of Contents    MAKING IT USEABLE

INTRODUCTION

DATA COLLECTION

DATA FILES

MAKING IT USEABLE

Editing

Online Edits
Preliminary Edits
Data Files
Useable Household
Recoding
Logical Edits

Weighting

Data Weighting Introduction
Impact of Using Unweighted Data
How the Weights Were Computed for NPTS
Which Weights To Use
Examples
Weights Related to Sample Strata
Use Weighted Data Except
What Weights to Use When Merging Files

Interpreting Estimates

NPTS Sample Design
The NPTS Sample Strata
Example Strata
Sampling Error
Sampling Bias
Calculating Confidence Limits on Sample Statistics
Sampling Error for the NPTS Full Sample
Sampling Error for Subsets of the NPTS Data
Confidence Limits
Calculating Confidence Limits for Subsamples of the Data
Limitations of NPTS
Glossary

Points To Remember

Points To Remember

ANALYSIS

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