StatBean Name: Histogram

Purpose: Constructs a frequency histogram to show the distribution of numeric data.

DataSource: Tabulation.

Read/Write Properties

Name	Type	Description	Possible Values	Default Value
drawNormalCurve	boolean	Whether to add the best-fitting normal distribution.	true,false	false
drawVertical	boolean	Whether to make the bars vertical.	true,false	true
fillColor	Color	Color to use for the bars.	Any valid Color.	Color.blue.
resolution	int	For continuous distributions, the number of points at which the function is calculated.	50+	500
scaleByPercentage	boolean	Whether to scale the axes by percentage rather than frequency.	true,false	false

Code Sample

//create a datasource bean
FileDataSource fileDataSource1 = new STATBEANS.FileDataSource();

//set the file name to be read
fileDataSource1.setFileName("c:\\statbeans\\samples\\cardata.txt");

//create a calculation bean
Tabulation tabulation1 = new STATBEANS.Tabulation();

//set the column to be tabulated
tabulation1.setXVariableName("mpg");

//set the type of tabulation and the limits
tabulation1.setDataType("Continuous");
tabulation1.setFrom(0.0);
tabulation1.setTo(60.0);
tabulation1.setBy(5.0);

//create a chart bean
Histogram histogram1 = new STATBEANS.Histogram();

//set the fill color
histogram1.setFillColor(Color.green);

//add a normal curve
histogram1.setAddNormalCurve(true);

//make the calculation bean a listener for changes in the FileDataSource bean
fileDataSource1.addDataChangeListener(tabulation1.listenerForDataChange);

//make the plot bean a listener for changes in the tabulation bean
tabulation1.addDataChangeListener(histogram1.listenerForDataChange);

//instruct the fileDataSource bean to read the file
fileDataSource1.readData();