  We present a statistical study of all measurable photometric features of a
large sample of dwarf novae during their outbursts and superoutbursts. We used
all accessible photometric data for all our objects to make the study as
complete and up-to-date as possible. Our aim was to check correlations between
these photometric features in order to constrain theoretical models which try
to explain the nature of dwarf novae outbursts. We managed to confirm a few of
the known correlations, that is the Stolz and Schoembs Relation, the Bailey
Relation for long outbursts above the period gap, the relations between the
cycle and supercycle lengths, amplitudes of normal and superoutbursts,
amplitude and duration of superoutbursts, outburst duration and orbital period,
outburst duration and mass ratio for short and normal outbursts, as well as the
relation between the rise and decline rates of superoutbursts. However, we
question the existence of the Kukarkin-Parenago Relation but we found an
analogous relation for superoutbursts. We also failed to find one presumed
relation between outburst duration and mass ratio for superoutbursts. This
study should help to direct theoretical work dedicated to dwarf novae.
