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##

Results

The first point to note about the results shown in
Figure is, that as we might have expected from the
results shown in Figure , Generalisation 60#60
is not able to discriminant between the three NRR algorithms,
having insufficient sensitivity. Specificity, however, as we might
have expected from its superior sensitivity, can discriminate
between the pairwise and groupwise methods; both groupwise
registrations give lower values of the specificity measure than
the pairwise algorithm. This difference persists as we vary the
number of model modes and is statistically significant.
We can conclude that either of
these groupwise algorithms is superior to the pairwise algorithm.

There is possibly a slight difference when the two groupwise
methods are compared, since one graph tends to lie lower than the
other. However, when we compare this difference to the size of the
error bars on the points, it is not large enough for us state that
there is a statistically significant difference between the two
groupwise variants.

Roy Schestowitz
2007-03-11