polio {gcmr} | R Documentation |
Polio Time Series
Description
Time series of Polio incidences in U.S.A. from 1970 to 1983.
Usage
data(polio)
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 . |
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.
Examples
data(polio)
[Package gcmr version 1.0.3 Index]