How does SYSTAT calculate seasonal adjustments in time series?

Question

SYSTAT computes seasonal adjustments via either multiplicative or additive models. What method does it use for these? Clearly it is not a simple differencing. I want to cite the software and state simply which method (filtering, etc., maybe XARIMA11?) it uses.

Answer 1

The SYSTAT program for Windows calculates seasonal adjustments in time series using either multiplicative or additive models. The specific method used for these adjustments is not mentioned in the given question.