- - - - - - - - - - - - - - - - x - - - - - - x - - - - x
- - - x - - - - x - - - - - - - - - - - x x - - - - - - -
- - - - - - - - x - - - - x - - - - - - - - x - - - - - -
- - - - - - - - - x x - - - - - - - - - - - - - - - x - -
- - - - - - - - - - - - - - - - - x - - - - - - - - - - -
- - - - x - - - - - - - - - - - x - - - - - - - - - - - -
- - - - - - - - - - x - - - - - - x - - - - - - - - - - -
- - - - - - x - - - - - x - - x - - - - - - - - - - - - -
- - - - - - - - x - - - - - - x - - - - - - - - - - - - x
- - - x - - - - - - - - - - - - - - - - - x x x x x - - -
x - - - - - - x - - - - - - - - - - x - - - x - - - - - -
- - - - x - - - - - - - - - - - - - - x - - - - - - - - -
- x - - - x - - - - - - - - - - - x - x - - - - - - - - -
- - - - - - - - x - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - x - - - - - - - - - - - -
- - - - - - - - x x - - - - - - - - - - - - - - x - - - -
- - - - - - - - - - - - - - - - - - x - - - - - - - - - -
- x - - - - - - - - - - - - - x - - x - - - - - - - - - -
- - - x - - - - - - - - - - - - - - - - - - - x - - - - -
- - - - - - - - - - - x - - - - - - - - - - - x - - - - -
- - - - - - - - x - - - - - - - - - - - - - x - - - - - -
- x - - - - - - - - - - - - - - - x - - - - - - - - - - -
- - - - - - - - x x - - - - - - - - - - - - x - - - - - -
Figure 2: A buyer (represented by "x") within a sequence
of e-shop visitors (represented by "-")
x x - x x x - - x x x x x x - x x - - - - - - - - - - - -
- - - - - - - x x x x - x - - x x - - x x - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - x x x x
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - x x - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - x x x x - - - - - x - - x x -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - x x x - - - - x x x - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - x x x - - - - - - - - - - - - - - - x x - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
x x x x x - - - - - - - - - - - x x - - x x x x x x - x -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - x x x x x x - - - - - - - - - - - - - - - - - - - -
Figure 3: Buyers’ burstiness (represented by "x") within a
sequence of e-shop visitors (represented by "-")
It should be noted that the terms "ga p", "ga p pro-
cess" and "gap distribution function" are used synony-
mously in th e present c ontribution. Gaps are rooted in
the Hidden Markov Models (HMM) (Gilbert, 1960;
Elliott, 1963). What has however intere sted commu-
nication protocol developers and coding theorists, are
the probabilities of error structures in any finite time
interval such as the block length or the cycle length
of a transmission pro c edure. These p robabilities are
typically difficult to present analytically. Some so-
lutions were presented by Wilhelm in 1976 resulting
in gap models such as the L-model or the A-model
(Wilhelm, 1976; Ahrens, 200 0). With these models
the bursty nature of tr a nsmission errors in ICT cou ld
be simulated. This approach based on gap processes
is now considered as a possible solution of evaluation
of buyers’ burstiness in e-business process. Fig. 4 il-
lustrates the e-business proc ess between two buyers
described by gaps. However, the buyers can be more
block interval n
buyer
sequence of people
visitor
Figure 4: Buyer’s gap for describing binary customer be-
havior
indepen dently distributed over e. g. a day or they can
appear really concentrated a s highlighted in Fig. 3.
In situations where binary decisions in e-business
processes such as selling or buying are made, not
only purchases and sales are of any interest but also
how concentrated goods are sold or bought. That is
why mo dels which focus only on the purchases and
sales with a given probability are not exact enough to
describe e-business process. In general, the buyers’
probability can serve as a clear in dicator of how of-
ten people decide to buy e. g. a pro duct. However,
the buyers’ probability does n ot de liver any infor-
mation about how concentrated the purchases and/or
sales are. Thus, buyers’ burstiness is a criterion in
e-business process. The criterion of buyers’ bursti-
ness includes suc h indicators as buyers’ probability
and buyers’ concentration (Ahrens et al., 201 5a) as
summarized in Tab. 2.
Table 2: Criterion and indicators of burstiness in e-business
process
Criterion Indicator
Buyers’ burstiness Buyers’ probability and
Buyers’ conc e ntration
For comparison p urposes of the present interdis-
ciplinary research, Tab. 3 demonstrates the criterion
and indicator of evaluation of burstiness of hot topic,
keyword, event, etc . in a sequence of batched geo-
referenc e d documents in social media. This model is
developed by a group of Japanese researchers as geo-
annotated user-generated data on social media sites is
becoming one of the most influential sources of infor-
mation (Kotozaki et al., 2015).
Table 3: Criterion and indicator of burstiness in social me-
dia
Criterion Indicator
Burstiness of hot topic or
keyword in a sequence of Locality
batched geore ferenced documents