Fits a ‘sin1’ (single frequency sinusoid) model to the time series.
The output is binary: 1 if the goodness of fit, R^2, exceeds 0.3 and
the amplitude of the fitted periodic component exceeds 0.5, and 0 otherwise.
- Parameters:
- y : array-like
The input time series.
- Returns:
Binary: 1 (= seasonal), 0 (= non-seasonal)
- Return type:
bool