R package to run seasonal analyses in time series. For details see our book "Analysing Seasonal Health Data" (2010) https://www.springer.com/gp/book/9783642107474.
Useful functions are:
casecross
for case-crossover analysis
nscosinor
to estimate non-stationary seasonal patterns using the Kalman filter
* nonlintest
for a time domain test of non-linearity
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