  Statistical analyses are invaluable methods used to understand intrinsic
emission processes and the unification of extragalactic radio sources. In this
paper, we collected radio, X-ray and {\gamma}-ray data of blazars from the
Fermi-LAT and Seyfert galaxies from the INTEGRAL survey and investigated the
relationship between the emission properties of Seyfert galaxies and blazar
subclasses of flat-spectrum radio quasars (FSRQs) and BL Lac subclasses (BL
Lacs). The results show from the average values that these objects follow a
sequence that is indicative of probable Seyfert galaxies - BL Lacs - FSRQs
unification. We discovered that Seyfert galaxies, BL Lacs and FSRQs share
similar emission characteristics in X-ray luminosity (LX-ray), suggestive of
the fundamental connection while the {\gamma}-ray and radio luminosities
(L{\gamma}-ray and Lradio) of Seyfert galaxies are the least powerful,
signifying an evolving structure. From the two-dimensional Kolmogorov-Smirnov
test (K-S test), we found that Seyfert galaxies differ from the blazar
subclasses in Lradio while there is no significant difference between them in
LX-ray and L{\gamma}-ray which implies that high energy emissions in Seyfert
galaxies and blazar subclasses may come from the same emission mechanism.
Significant positive correlations exist between the high energy luminosities
(X-ray and {\gamma}-ray bands) and the low energy component (radio) within the
whole sample of blazars and Seyfert galaxies implying a form of connection
between them. These results are not only consistent with the prediction of the
unified scheme for blazars but also show that Seyfert galaxies have an
evolutionary link with blazar subclasses.
