  Different variants of MFDFA technique are applied in order to investigate
various (artificial and real-world) time series. Our analysis shows that the
calculated singularity spectra are very sensitive to the order of the
detrending polynomial used within the MFDFA method. The relation between the
width of the multifractal spectrum (as well as the Hurst exponent) and the
order of the polynomial used in calculation is evident. Furthermore, type of
this relation itself depends on the kind of analyzed signal. Therefore, such an
analysis can give us some extra information about the correlative structure of
the time series being studied.
