statsmodels.tsa.deterministic.Seasonality¶

class statsmodels.tsa.deterministic.Seasonality(period, initial_period=1)[source]¶

Seasonal dummy deterministic terms

Parameters:¶

periodint

The length of a full cycle. Must be >= 2.

initial_periodint

The seasonal index of the first observation. 1-indexed so must be in {1, 2, …, period}.

Attributes:¶

initial_period

The seasonal index of the first observation

is_dummy

Flag indicating whether the values produced are dummy variables

period

The period of the seasonality

See also

DeterministicProcess

TimeTrend

Fourier

CalendarSeasonality

Examples

Solar data has an 11-year cycle

>>> from statsmodels.datasets import sunspots
>>> from statsmodels.tsa.deterministic import Seasonality
>>> data = sunspots.load_pandas().data
>>> seas_gen = Seasonality(11)
>>> seas_gen.in_sample(data.index)

To start at a season other than 1

>>> seas_gen = Seasonality(11, initial_period=4)
>>> seas_gen.in_sample(data.index)

Methods

from_index(index)	Construct a seasonality directly from an index using its frequency.
in_sample(index)	Produce deterministic trends for in-sample fitting.
out_of_sample(steps, index[, forecast_index])	Produce deterministic trends for out-of-sample forecasts

Properties

initial_period	The seasonal index of the first observation
is_dummy	Flag indicating whether the values produced are dummy variables
period	The period of the seasonality