​
elevator maintenance​
where there are 497 elevators
​distributed in 99 different buildings
​​
. . . . . . . . . . . .
​
hundreds of elevator problems
are reported and need to be solved
each month
​
. . . . . . . . . . . .
​
elevator malfunctions
spread in
a wide range
​
ELEVATOR – OUT OF ORDER
ELEVATOR DOORS
ELEVATOR STUCK & OCCUPIED
​​
. . . . . . . . . . . .
​
The causes
of these elevator problems
are various
​
. . . . . . . . . . . .
​
“What are the most frequent
types of elevator troubles
in a building?”
​
​​the large volume of reports
the variety of the types of elevator problems
the cost of repairing an elevator
​
the efficiency of the mechanics
the concerns of the manager
and the results
​
. . . . . . . . . . . .
​
visualize
the multi-dimensional information
of each elevator malfunction event
​
fifteen
categorical
variables
​
​rectangular tables
of
frequencies
​
contingency tables
with non negative
value
​
. . . . . . . . . . . .
​
make a
decomposition
and a graphical representation of
​
deviations
from
independence
​
. . . . . . . . . . . .
​
visualize
the results
the information
​