Working with Heat Maps
About Heat Maps
A heat map displays
the distribution of values for two data items by using a table with
colored cells. If you do not assign a measure to the Color data
role, then a cell’s color represents the frequency of each
intersection of values. If you assign a measure to the Color data
role, then a cell’s color represents the aggregated measure
value for each intersection of values.
Data Roles for a Heat Map
The basic data roles
for a heat map are:
X axis
specifies the data
item that is assigned to the X axis.
Y axis
specifies the data
item that is assigned to the Y axis.
Color
specifies a measure
that determines the cell color. If you do not assign the Color role,
then the cell color indicates frequency.
Specify Properties for a Heat Map
On the Properties tab,
you can specify the following options:
Name
specifies the name
of the visualization.
Title
specifies the title
that appears above the graph.
Note: The Title option
is disabled if you select Generate graph title.
Generate graph title
specifies that the
graph title is generated automatically based on the data items in
the visualization.
Bin count
specifies the number
of value ranges that are represented as cells. Bin count affects
only measures.
Show borders
specifies that the
borders between cells are visible.
Rotate axis labels
displays the category
labels at an angle.
Note: The Rotate axis
labels option affects only the values on the X axis.
Note: The Rotate axis
labels option has no effect if the heat map contains
no categories.
Color gradient
selects the gradient
colors for the visualization.
You can click 
to select the values that are used to assign the
colors. See
Specify a Custom Data Range.
to select the values that are used to assign the
colors. See
Specify a Custom Data Range.Fit line
adds a fit line to
the heat map. For
information about the fit types that are available, see
Fit Lines.
Note: Fit lines are not available
if a category is assigned to the heat map.
Applying Data Analysis
About Data Analysis
For heat maps, you can
apply the following data analyses:
Correlation
identifies the degree
of statistical correlation between the variables in the visualization. For more information,
see
Correlation.
Fit Line
plots a model of the
relationship between the variables in the visualization.
There are many types
of fit lines, including linear fit, quadratic fit, cubic fit, and
penalized B-spline. For more information, see
Fit Lines.
Correlation is applied
to your visualization automatically when you add a linear fit line.
It is not available with other fit types.
Enable Data Analysis
To add a fit line to
your visualization, select the 
drop-down list from the visualization toolbar, and
then select Fit Line
fit-type. For information about the fit types that are available,
see
Fit Lines.
drop-down list from the visualization toolbar, and
then select Fit Linefit-type. For information about the fit types that are available,
see
Fit Lines.Note: Fit lines are not available
if your heat map contains categories or hierarchies.
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