PPI Repository

Expected Service Time from activity A to activity B

\mathit{e}\mathit{STAB}\mathit{^{\times}}(g, \mathit{a}, \mathit{b})

\mathit{\times} \in \{\mathit{s}, \mathit{c}, \mathit{sc}, \mathit{w}\}

Dimension:

Time

Granularity:

Group of cases

Description

Expected sum of elapsed time between the start and complete events of all activity instances of a case belonging to a group of cases, which occur between the earliest instantiation of a specific activity, and the earliest instantiation of another specific activity that occurs after the former one, including both.

Potential use

Event log is associated with a process in which the actual time spent executing a specific subprocess is of relevance.

Assumptions

Minimizing service time is desirable.

Desired Value:

MINIMIZE

Required attributes

act
actinst
case
time
type

Equations

Formula for practitioners

$\frac{\mathit{STAB}(g, \mathit{a}, \mathit{b})}{|\{c \in g \mid \mathit{fi}(c, \mathit{a}, \mathit{b}) \neq \emptyset\}|}$

$\mathit{STAB}$ returns the total service time from activity $\mathit{a}$ to activity $\mathit{b}$ accumulated across all cases in group $g$ .
$\mathit{fi}$ returns the set of first instances of activity $\mathit{b}$ that occur after the first instance of $\mathit{a}$ in case $c$ .

Formal Definition

$\frac{\mathit{STAB}\mathit{^{\times}}(g, \mathit{a}, \mathit{b})}{|\{c \in g \mid \mathit{fi}\mathit{^{sc}}(c, \mathit{a}, \mathit{b}) \neq \emptyset\}|}$
The $\mathit{\times}$ indicates that the PPI can take multiple forms, in this case, $\mathit{\times} \in \{\mathit{s}, \mathit{c}, \mathit{sc}, \mathit{w}\}$ . If $\mathit{\times} = \mathit{s}$ , then the function considers activity instances that were started within the start and end activity instances, i.e., it uses $\mathit{STAB}\mathit{^{s}}$ ; if $\mathit{\times} = \mathit{c}$ , then the function considers activity instances that were completed within the start and end activity instances, i.e., it uses $\mathit{STAB}\mathit{^{c}}$ ; if $\mathit{\times} = \mathit{sc}$ , then the function considers activity instances that were either started or completed within the start and end activity instances, i.e., it uses $\mathit{STAB}\mathit{^{sc}}$ ; if $\mathit{\times} = \mathit{^{w}}$ , then the function considers all activity instances that were active within the start and end activity instances, i.e., it uses $\mathit{STAB}\mathit{^{w}}$ .

Python implementation

This indicator is implemented in the process_performance_indicators Python library.

process_performance_indicators.indicators.time.groups.expected_service_time_from_activity_a_to_b

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