Time series of Polio incidences in U.S.A. from 1970 to 1983.
data(polio)
A data frame with the 168 monthly observations (from January 1970 to December 1983) with the following variables
y
t*10^( -3 )
cos( 2*pi*t/12 )
sin( 2*pi*t/12 )
cos( 2*pi*t/6 )
sin( 2*pi*t/6 )
# NOT RUN { data(polio) # }
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