  The self-affine analysis and erraticity analysis of pseudorapidity gaps are
performed for the data of 400GeV/$c$ pp collisions. The self-affine analysis
has been shown to exhibit a better scaling behavior. The self-affine
multifractal dimensions and multifractal spectrum have been obtained. The
simulated results using FRITIOF program can not reproduce the scaling behavior.
The analysis of event-to-event fluctuations has been performed. The increase of
event-space moments $C_{p,q}(M)$ with decreasing phase-space scale is dominated
by the statistical fluctuations. The erraticity analysis based on measuring the
pseudorapidity gaps is also performed. The entropy-like quantities $S_q$ and
$\Sigma_q$ deviate from 1 significantly, implying that both of them are useful
to serve as effective measures of erraticity in multiparticle production. The
ln${S_q}$ versus $q$ has a quite linear behavior, but the ln${\Sigma_q}$ versus
$q$ has only an approximate linear behavior. The FRITIOF simulated results
follow the same scaling behavior, but the deviations from the experimental data
are rather large.
