Graphics Reference
In-Depth Information
Figure . . A general view on possible linking structures between the active plot
D
and the passive
plot
D
assuming that information sharing is only possible among identical plot layers
hus, four types of linking structures can be distinguished: linking frames, linking
types, linking models, and linking sample populations. At the type and at the model
level the linking structures can be further differentiated into data linking and scale
linking, the latter being used when scales or scale representing objects are involved
in the linking process.
Sharing and exchanging information between two plots can now be resolved in
twodifferentways.heoneinvolvesusingthedirectlinkingschemefromonelayerin
display
. he other is a combined scheme
that first propagates the information internally in the active plot to the sample pop-
ulation layer; then the sample population link is used to connect the two displays,
and the linked information is then internally propagated in the passive plot to the
relevant layers. Hence the most widely used and most important linking structure is
sample population linking.
D
to the corresponding layer in display
D
Linking Sample Populations
8.2.1
Sample population linking connects two displaysandprovidesageneral platform for
all different kinds of user interactions. In general, sample-population-based linking
for two data displays
Ω that maps
the elements of the sample population space Ω to some elements of the space Ω .
Sample population linking is usually used to create subsets of adataset and tolook at
conditional distributions. Fromthis point of view it isintrinsically necessary that the
relation between Ω and Ω generates a joint sample space such that the conditional
distributionstobeinvestigatedareproperlydefined.Somenaturalsamplepopulation
linking structures encompass this property by default.
D
and
D
can be defined as a mapping m
Ω
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