This report involves numerous descriptive statistical analyses of the daily variability of time-
use diaries contained in the US Environmental Protection Agency's CHAD database. CHAD …

The original development of CHAD contained data from 10 studies, and was described in
McCurdy et al.(2000). The original Microsoft Access version of the database is documented …

Study Design One of the recent national time-use studies is the 1992-1994 survey
conducted by the University of Maryland's Survey Research Center (Triplett, 1995) on behalf …

The unique features of and approaches to collecting time-diary data in the survey context
are discussed. Sample diary report forms and activity coding schemes are presented and …

Because human activities impact the timing, location, and degree of pollutant exposure, they
play a key role in explaining exposure variation. This fact has motivated the collection of …

Time-use data have unique characteristics that make it different from other types of
household survey data. Single-day time use surveys provide a detailed snapshot of a …

Understanding the longitudinal properties of the time spent in different locations and
activities is important in characterizing human exposure to pollutants. The results of a four …

This study compares two North American time–activity data bases: the National Human
Activity Pattern Survey (NHAPS) of 9386 interviewees in 1992–1994 in the continental USA …

Because human activities impact the timing, location, and degree of pollutant exposure, they
play a key role in explaining exposure variation. This fact has motivated the collection of …

This chapter focuses on issues regarding the methodology and data quality inherent to the
American Time Use Survey (ATUS). The ATUS is the first federally funded, ongoing, and …