These data sets are included as part of the trellis library and are used in example functions and help files supplied with the library. They are described in more detail in Cleveland (1993). The name of each data set is the same as the name used in the reference; to find more about the barley data, for example, look under "data, barley" in the book index.
yield,
variety,
year, and
site,
giving barley yields (bushels/acre) in 1931 and 1932 for 10 varieties
of barley grown at 6 sites.
The data sets
barley.exposed and
barley.disease in S-PLUS are
not related to data set
barley.
carbon and
thorium giving estimated
dates of coral samples using two dating methods.
ozone,
radiation,
temperature, and
wind.
Measurements of daily ozone concentration (ppb), wind speed (mph),
daily maximum temperature (degrees F), and solar radiation (langleys)
on 111 days from May to September 1973 in New York.
This data frame is similar to
air in S-PLUS (or library(data) in S),
but has a different definition for
ozone
(
air contains cube-roots of
ozone).
time, the time in seconds for 78
subjects to recognize
a pattern in a random dot stereogram, and
nv.vv, a factor that tells
whether visual and verbal information was given to the subject (level
VV).
cp.ratio, the ratio of
central to peripheral ganglion cell density, and
area, the area
(mm^2) of the retina.
lung,
heart,
liver,
spleen,
kidney, and
testes.
year,
incidence and
sunspot.
concentration measures particulate concentration
(micro-grams/cubic meter) and
babinet is the angle (degrees) at which
polarization of sunlight vanishes.
hardness (degrees shore),
tensile.strength (kg/cm^2),
abrasion.loss (g/hp-hour);
ts.low and
ts.high are amounts the
tensile strength are less than or greater than 180.
height (inches) and
voice.part.
Cleveland, William S. (1993). Visualizing Data. Hobart Press, Summit, New Jersey.