Graphics Reference
In-Depth Information
Figure
.
.
Changing variables in one view. he right view is similar to Fig.
.
, with the addition of
a
.
% confidence interval for the mean fitted value. he let view has been let unchanged in
definition, except that a different base variable has been used; the histogram is now of the number of
years a player has been in the league
The Linked Views Paradigm
9.2
InSect.
.
,weshowed examples ofthe linked viewsparadigm. Inthis section wewill
define it more exactly and detail how a linked views paradigm may be implemented.
To implement a linked views system, the fundamental need is an interactive en-
vironment. Linking is an interaction mechanism and therefore requires a computer
or other system for interaction with graphical representations of data. Given such an
environment, alinked views environment needs tohave morethan oneview, andthe
views available to the user must satisfy the following conditions:
. At least one view must be capable of detecting user interaction and translating
that user interaction into a measure of the degree of interest that user has in the
data being displayed in that view. he degree of interest must be able to distin-
guish between subsets of the data based on the user's interaction.
. A mechanism is needed to propagate the degree of interest measures created in
view (
) to other views in the system.
. At least one view that is not the view described in (
) should be capable of re-
sponding to the measure of interest propagated to it under (
). he response
shouldbetochangeitsvisualappearancesoastoshowthedegreeofinterest
measures as they relate to the data being displayed by this view.
he concept of “degree of interest” is worth considering in more detail. It is intended
to measure the degree to which the user finds any subset of data interesting. By se-
lecting the bars corresponding to five or more years in the league in Fig.
.
, the
user indicates which portion of the data they are interested in, namely rows where
thenumberofyearsintheleagueis
ormore.hedegree-of-interestmeasureshould
