Modified QS Seasonality Test (Maravall)
Usage
seasonality_modified_qs(data, period = NA, nyears = 0)
Arguments
- data
the input data.
- period
Tested periodicity. Can be missing if the input is a time series
- nyears
Number of periods or number of cycles considered in the test, at the end of the series:
in periods (positive value) or years (negative values).
By default (nyears = 0
), the entire sample is used.
Value
The value of the test
Details
Thresholds for p-values: p.9=2.49, p.95=3.83, p.99=7.06, p.999=11.88.
Computed on 100.000.000 random series (different lengths).
Remark: the length of the series has some impact on the p-values, mainly on
short series. Not critical.
Examples
s <- do_stationary(log(ABS$X0.2.09.10.M))$ddata
seasonality_modified_qs(s)
#> [1] 747.7281