2001 national household travel survey user's guide - NHTS Home ...

TABLE OF CONTENTS
(continued)
3-D.3. APPROACH TO POST INTERVIEW EDITING.......................... 3-16
3-D.4. POST DATA COLLECTION EDITING ....................................... 3-16
3-D.4.A. EDIT FLAGS ................................................................ 3-17
3-D.4.B. IMPUTATION FLAGS .................................................. 3-18
3-D.5. IMPUTING DATES FOR RECURRING TRAVEL PERIOD
TRIPS ........................................................................................ 3-20
3-D-6. TRIP REPORTING .................................................................... 3-21
3-D.7. DATA MOVED FROM CATI TO DATA FILES SPECIFIED
BY DOT...................................................................................... 3-22
3-D.8. USEABLE HOUSEHOLDS ........................................................ 3-22
3-D.9. HUNDRED PERCENT HOUSEHOLDS ..................................... 3-24
3-D.10 EDITING THE DELIVERY DATASETS..................................... 3-24
3-E. SURVEY METHOD AND PROCEDURE CHANGES............................ 3-25
3-E.1. 2001 NHTS CHANGES.............................................................. 3-25
3-F. PROCEDURES TO ENSURE CONFIDENTIALITY.............................. 3-29
CHAPTER 4. SURVEY RESPONSE RATES ............................................................... 4-1
CHAPTER 5. WEIGHT CALCULATIONS .................................................................... 5-1
5-A. HOUSEHOLD WEIGHTS ....................................................................... 5-1
5-A.1. INITIAL HOUSEHOLD WEIGHT .................................................. 5-1
5-A.2. USEABLE HOUSEHOLD WEIGHT.............................................. 5-3
5-A.3. HUNDRED PERCENT REPORTED HOUSEHOLD WEIGHT...... 5-4
5-B. PERSON WEIGHTS............................................................................... 5-5
5-B.1. USEABLE HOUSEHOLDS PERSON WEIGHT ........................... 5-5
5-B.2. HUNDRED PERCENT REPORTED HOUSEHOLDS PERSON
WEIGHT....................................................................................... 5-5
5-C. PERSON TRIP WEIGHTS FOR TRAVEL DAY DATA............................ 5-6
5-D. TRAVEL PERIOD WEIGHTS ................................................................. 5-6
5-D.1. HOUSEHOLD TRIP WEIGHTS FOR TRAVEL PERIOD ............. 5-6
5-D.2. PERSON TRIP WEIGHTS FOR TRAVEL PERIOD ..................... 5-6
5-E. DISTRIBUTION OF NUMBER OF TRAVEL PERIOD TRIPS ................. 5-7
CHAPTER 6. DESCRIPTION OF DATA FILES............................................................ 6-1
6-A. STRUCTURE OF THE DATA FILES ...................................................... 6-1
6-A.1. BASIC STRUCTURE ................................................................... 6-1
6-B. RELATIONSHIP BETWEEN THE FOUR NHTS DATA FILES ............... 6-3
6-B.1. TYPICAL NHTS HOUSEHOLD.................................................... 6-3
6-B.2. WHEN IS A RECORD ON THE FILE ........................................... 6-4
6-B.3. HOUSEHOLD MEMBER VARIABLES ......................................... 6-5