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In-Depth Information
relationship between Y and Z?”, and “My clustering algorithm made these items into
a group. Now what does this group actually look like?” are some of the questions for
whichthis technique ishighly suitable. Linked views isalso apowerfulsystem forin-
tegrating domain-specific views into a general-purpose system. Designing a linked
view, or modifying an existing view to fit the paradigm, is typically simple and, most
importantly, does not require many changes to a specific view that is known to work
well. his chapter has presented the necessary techniques and decisions that need to
be considered to implement or use a system of linked views. We have demonstrated
both simple and advanced versions of the linking environment using real-world data
with sizes up to
records. Linked views isa general technique that is widely ap-
plicable,worksforalltypesandsizesofdata,andisasrobustastheviewsthatitlinks
together. It has been implemented in several systems and with increasing computer
power, and it is anticipated that it will continue to advance as a standard analysis
technique.
Data Used in This Chapter
9.9
he baseball dataset is taken from he Baseball Archive, version
.
, November
,
, collected by Sean Lahman, which is available at http://www.baseball
.com/.
Access to the dataset is provided free of charge (although donations are suggested)
and has been available for many years. It contains
different tables, indexed toallow
database joins. he tables used in this chapter are:
Master table: data about players including name, height, weight, handedness, birth-
place, and birthdate.
Batting table: detailed data about how a player batted in a given regular season: at-
bats, hits, runs, multibase hits, stolen bases, etc.
Fielding table: detailed data about how a player fielded in a given regular season:
assists, putouts, errors, games played, etc.
Salary table: how much a player was paid in a given season.
Baseball players can be divided into two groups. Pitchers, who throw the ball, and
batters,whoattempt tohittheball andscorerunsbydoingso.Inthis section wecon-
sider only batters. he statistics for games(G) and at-bats measure how oten a batter
played. he other batting statistics measure how well they performed during their
appearances.
Batters also play a defensive role when the opposition team is batting. hey field
the ball in an attempt to limit runs and to dismiss the opposition batters. A fielder
has a designated position to play, with infielders [
B (firstbase),
B(second base),
B
(thirdbase),andSS(shortstop)]playingclosetotheoppositionbattersandoutfielders
playing further away and seeing less action in a game. An important special position
is the designated hitter - DH. A player at this position is not required to field and
has no role on the team except to attempt to hit the ball. Effectively he will have no
fielding statistics. he putout statistic counts the number of times a fielder dismisses
