Description
Time series of Polio incidences in U.S.A. from 1970 to 1983.
Format
A data frame with the 168 monthly observations (from January 1970 to December 1983) with the following variables
y |
| time series of polio incidences. |
t*10^( -3 ) |
| linear trend multiplied by factor $10^{(-3)}$. |
cos( 2*pi*t/12 ) |
| cosine annual seasonal component. |
sin( 2*pi*t/12 ) |
| sine annual seasonal component. |
cos( 2*pi*t/6 ) |
| cosine semi-annual seasonal component. |
sin( 2*pi*t/6 ) |
| sine semi-annual seasonal component. |
Source
Zeger, S.L. (1988). A regression model for time series of counts. Biometrika 75, 822--835.