Geoscience Reference
In-Depth Information
a
b
c
Fig. 5.18
Mann-Whitney and Ansari-Bradley tests on synthetic dust l ux record.
a
Lognormal
distributed noise. At er 250 kyrs the mean and variance of the data shit s towards a lower
value.
b
Result of a Mann-Whitney test for three dif erent lengths of the paired sliding
windows (150, 250 and 500 data points, equivalent to 15, 25 and 50 kyrs). h e length of the
window clearly inl uences the amplitudes and widths of the parameter maxima, whereas the
location of the transition in the mean is well dei ned.
c
Result of a Ansari-Bradley test for
three dif erent lengths of the paired sliding windows (150, 250 and 500 data points, equivalent
to 15, 25 and 50 kyrs). h e length of the window clearly inl uences the amplitudes and widths
of the parameter maxima, and the location of the transition in the dispersion is well dei ned.
