19 measuremenents of wind direction 'theta' and ozone level 'x' taken at 6.00am at four-day intervals between April 18th and June 29th, 1975 at a weather station in Milwaukee.
fisherB18 is a
data.frame of integer value.
fisherB18c is a
data.frame that contains the same observations, but in the first column, the data is a
N.I. Fisher (1993) pag. 251. Johnson & Wehrly (1977, Table 1).
N.I. Fisher (1993) Statistical analysis of circular data. Cambridge University Press.
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