Description Usage Format Source Examples
The UtahPEF
data frame data contains longitudinal data on peak expiratory flow, air pollution and temperature for a cohort of 41 schoolchildren in the Utah Valley, U.S.A., during 1990-1991.
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This data frame contains the following columns:
idnum
schoolchild identification number.
devPEF
daily peak expiratory flow measurements for each schoolchild minus the overall average for that schoolchild.
PM10withMA5
5-day moving average of the concentration of particulate matter 10 micrometers or less in diameter.
lowTemp
lowest temperature in degrees Fahrenheit on the day of recording.
timeTrend
day of the study on which the measurements were made.
Pope, C.A., Dockery, D.W., Spengler, J.D. and Raizenne, M.E. (1991). Respiratory health and PM_10 pollution: a daily time series analysis. American Review of Respiratory Disease, 144, 668-674.
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