To plot points, type values in the x and y columns. Use the "enter" key to go to the next value. A more detailed explanation is given below. To see the graph in a larger window, click on the Launch Scatter Plots button.

Click the following button to open another version of the applet in a separate window. In this version, several sample files of data have been made available in a menu at the top of the window. When the user clicks the "Load File" button, a data file is loaded and its contents are used to replace the numbers currently in the table..

Explanation of the applet: The ScatterPlotApplet draws a scatter plot of points (a,b), where the data is taken from an input table. The table is on the left side of the applet and can be edited by the user. By default, the applet will also show the regression line for the data and some statistics (the slope and y-intercept of the regression line and the correlation coefficient for the data). Each data point comes from one row in the table. Two input boxes at the bottom specify how the data points (a,b) are to be computed from the data. By default, a is just the entry in the first column of the table and b is the entry from the second column. However, a and b can be computed from other expressions, which can use the column names as variables. For example, it is possible to plot sqrt(X) versus Y. The special variable "rowNumber" can also be used in the expressions to represent the number of the row in the table.

When editing the table, the user can move among the cells of the table with the arrow keys, the tab key and the return key. A new row is added automatically when the user moves down from the last row of the table, provided that row is empty. An empty row at the bottom of the table is always completely ignored in the calculations for the scatter plot and regression line. Missing values are reported as errors, but it is possible to change this behavior with an applet param. Here is what the applet looks like when no applet params are specified: