Monthly time series of poliomyelitis cases reported to the U.S. Centers for Disease Control for the years 1970 to 1983, 168 observations.
The format is: Time-Series [1:168] from 1970 to 1984: 0 1 0 0 1 3 9 2 3 5 ...
The data were originally modelled by Zeger (1988).
Zeger, S. L. (1988), ``A Regression Model for Time Series of Counts,'' Biometrika, 75, 822-835.
# NOT RUN { tsplot(polio, type='s') # }
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