Tableau - Box Plot

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Tableau - Box Plot
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Tableau - Box Plot
The box plots are also known as a box-and-
whisker plots. They show the distribution of
values along an axis. Boxes indicate the middle
50 percent of the data which is, the middle two
quartiles of the data's distribution. The
remaining 50 percent of data on both sides is
represented by lines also called whiskers,
to display all points within 1.5 times the
interquartile range. which is all points within
1.5 times the width of the adjoining box, or all
points at the maximum extent of the data.
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The Box Plots take one or more measures with
zero or more dimensions. Box plots divide the
data into sections that each contain
approximately 25 of the data in that set. Box
plots are useful as they provide a visual
summary of the data enabling researchers to
quickly identify mean values, the dispersion of
the data set, and signs of skewness. A boxplot
can give you information regarding the shape,
variability, and center (or median) of a
statistical data set. Also known as a box and
whisker chart, boxplots are particularly useful
for displaying skewed data. Statistical data
also can be displayed with other charts and
graphs.
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Uses of Bullet Graph
Bullet graphs are used to compare one
value, represented by a horizontal bar, to
another value, represented by a vertical line,
and relate those to qualitative ranges. It
compares sales performance for spices in
different regions this year to sales performance
last year. The bullet graph features a single,
primary measure (for example, current
year-to-date revenue), compares that measure to
one or more other measures to enrich its
meaning (for example, compared to a target), and
displays it in the context of qualitative ranges
of performance, such as poor, satisfactory, and
good.
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Creating a Box Plot
Using the Sample-superstore, plan to find the
size of profits for the respective category for
each Ship mode values. To achieve this
objective, following are the steps. Step 1 - Drag
and drop the dimension category to the Columns
shelf and profit to the Rows shelf. Also drag
the dimension Ship mode to the right of Category
in Columns shelf. Step 2 - Choose Box-and-Whisker
plot from Show Me. The following chart appears
which shows the box plots. Here,
Tableau automatically reassigns the ship mode to
the Marks card.
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Box Plot with Two Dimensions

• You can create box plots with two dimensions by
  adding another dimension to the Column shelf.
• In the above chart, add the region dimension to
  the Column shelf.
• This produces a chart which shows the box plots
  for each region.

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