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The program will plot multiple Y variables against one X variable.   The data for this chart must be in columns with the X variable in the first column.   The Y variables must be in adjacent columns.   An example of how to create this chart is given below for plotting two Y variables against the X variable.

An experiment has been to do to measure the amps from a process over time.   The experimenter wants to compare the measured amps to the theoretical amp.   

1. Enter the data into a worksheet as shown below. The data can be downloaded at this link.

Data Entry 

2. Select the data and the column headings.

3. Select "Correlation" from the "Statistical Tools" panel on the SPC for Excel ribbon.

4. Select the "Plot Multiple Y Variables Against One X Variable" option and then OK.

5. The following input box is used to enter the range containing the data and the headings.  The default is the range selected on the worksheet.

Input Screen

  • Enter range: enter the worksheet range containing the data and the headings; the data must be in columns with the x values in the first column followed by the y values in adjacent columns; the default is the range selected on the worksheet.
  • Enter Title and Labels: enter the title, y-axis label, and x-axis label; there is no default title, but the default for the y-axis is "Y" while the default for the x-axis is the first cell in the column containing the x values.
  • Dates of Data Collection: enter the dates of data collection; optional, if printed will appear in the lower left-hand corner of the chart.
  • Select OK to generate the results.
  • Select Cancel to end the program.

The chart generated by the above data are shown below.


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