ozone.NY:
New York ozone concentration levels
Description
The ozone.NY data frame consists of hourly $O_3$
concentration levels (ppb) from nine stations in New York State
numbered for our purposes from 1 to 9. These data were originally
downloaded from the EPA's AIRS air quality site (Environmental
Protection Agency 2013). Furthermore, preliminay analysis
suggested a sqrt transformation of the original concentrations to
symmetrize the data distribution.
Format
Each row of the data set represents a daily record starting at
April 1, 1995, and ending at September 30, 1995 (183 days).
Measurements are recorded by station in columns, with four columns
per station (for hours 8--12); there are nine stations, so there
are 36 columns of measurements in total. The last six stations have no missing observations while stations
1, 2, 3 have 2616, 2016, and 72 missing hourly observations,
respectively.
month- month of the measurement, numeric 4--9
weekday- day of the week, numeric 2--8
sqO3.1--sqO3.4-
square root of the $O_3$ measurement for station 1 for
hours 8--12 (8am to noon).
- $\dots$
sqO3.33--sqO3.36-
square root of the $O_3$ measurement for station 9 for
hours 8--12 (8am to noon).