The methods supported by this function are
timeseries:regress(int/long/float/double y, int/long/float/double x1, int/long/float/double x2 ...)
and
timeseries:regress(int calcInterval, int batchSize, double confidenceInterval, int/long/float/double y, int/long/float/double x1, int/long/float/double x2 ...)