Help Manual

Contents






Sigma Magic Help Version 18

Pie Chart

Overview

The pie chart tool can create a pie chart for the given data points. Pie charts can be used to compare different data sets on a single chart. A pie Chart can give an idea of the relative contribution of the different discrete causes.

This tool can be added to your active workbook by clicking on Graph and then selecting Pie Chart.

Inputs

Click on Analysis Setup to open the menu options for this tool. A sample screenshot of the menu is shown below. inputs
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Chart Type: Specify the format of the chart. This selection is not enabled since there is only one format available.
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Graph Options: Specify the type of pie chart that you would like to create. The options available are:
OptionDescription
2D ChartThe pie chart can be plotted in either 2D format or 3D format. The default type of pie chart is 2D.
3D ChartUse the 3D pie chart to add dimension to your pie chart.
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Data Order: Specify if the data has to be sorted before plotting it. The available options are:
FormatDescription
DefaultDo not sort the data. Plot it in the order in which it is entered.
IncreasingSort the data in increasing order before plotting it.
DecreasingSort the data in decreasing order before plotting it.
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Data Labels: Specify if you want to display the legend for the chart. The available options are:
OptionDescription
NoneDo not display any legend on the chart.
BottomDisplay the legend at the bottom of the chart.
LeftDisplay the legend on the left side of the chart.
RightDisplay the legend on the right side of the chart.
TopDisplay the legend on top of the chart.
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Help Button: Click on this button to open the help file for this topic.
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Cancel Button: Click on this button to discard any changes and close the dialog box.
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OK Button: If possible, click this button to save any changes and compute the analysis outputs.

Data

You will see the following dialog box if you click the Data button. Here, you can specify the data required for this analysis. Data
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Search Data: The available data displays all the columns of data that are available for analysis. You can use the search bar to filter this list and speed up the search for the right data for analysis. Enter a few characters in the search field, and the software will filter and display the filtered data in the Available Data box.
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Available Data: The available data box contains the list of data available for analysis. If your workbook has no data in tabular format, this box will display "No Data Found." The information displayed in this box includes the row number, whether the data is Numeric (N) or Text (T), and the name of the column variable. Note that the software displays data from all the tables in the current workbook. Even though data within the same table have unique column names, columns across different tables can have similar names. Hence, it is crucial that you not only specify the column name but also the table name.
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Add or View Data: Click on this button to add more data to your workbook for analysis or to view more details about the data listed in the available data box. When you click on this button, it opens the Data Editor dialog box, where you can import more data into your workbook. You can also switch from the list view to a table view to see the individual data values for each column.
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Required Data: The code for the required data specifies what data can be specified for that box. An example code is N: 2-4. If the code starts with an N, you must select only numeric columns. If the code begins with a T, you can select numeric and text columns. The numbers to the right of the colon specify the min-max values. For example, if the min-max values are 2-4, you must select a minimum of 2 columns of data and a maximum of 4 columns in this box. If the minimum value is 0, then no data is required to be specified for this box.
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Select Button: Click on this button to select the data for analysis. Any data you choose for the analysis is moved to the right. To select a column, click on the columns in the Available Databox to highlight them and then click on the Select Button. A second method to choose the data is to double-click on the columns in the list of Available Data. Finally, you can drag and drop the columns you are interested in by holding down the select columns using your left mouse key and dragging and dropping them in one of the boxes on the right.
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Selected Data: The list box header will be displayed in black if the right number of data columns is specified. If sufficient data is not specified, the list box header will be displayed in red. Note that you can double-click on any of the columns in this box to remove them from the box.
6a
Frequency Variables: This list box contains the frequency values for each row of data specified under categorical variables. This column is not mandatory. If it is not specified, the frequency values are assumed to be 1. Note that if this column has been defined, it should contain numeric integer values. The number of rows of data in this column should match the number of rows specified in the categorical variables.
6b
Categorical Variables: This list box contains the categories to use to create the pie chart. This column is mandatory. Note that this column usually contains text. You can specify one column or two columns for this analysis. If you specify two columns, then the information in both columns is used to create the pie chart. You will get two levels for the legend in this case.
6c
By Variable: This list box contains a column that can be used to create subgroups for the plots. This column is not mandatory. If you specify a column here, it should include the same number of rows of data as defined in the categorical variables. For example, if this column contains two values, "Before" and "After," then the data specified is unstacked, and two pie charts are created: one for the "Before" data and one for the "After" data.
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View Selection: Click on this button to view the data specified for this analysis. The data can be viewed in a tabular format or a graphical summary.

Charts

You will see the following dialog box if you click the Charts button. Charts
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Title: The system will automatically pick a title for your chart. However, if you want to override that with your title, you can specify a title for your chart here. Note that this input is optional.
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Sub Title: The system will automatically pick a subtitle for your chart. However, if you want to override that with your subtitle, specify a subtitle for your chart here. Note that this input is optional.
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X Label: The system will automatically pick a label for the x-axis. However, if you would like to override that with your label for the x-axis, you can specify a different label here. Note that this input is optional.
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Y Label: The system will automatically pick a label for the y-axis. However, if you would like to override that with your label for the y-axis, you can specify a different label here. Note that this input is optional.
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X Axis: The system will automatically pick a scale for the x-axis. However, if you would like to override that with your values for the x-axis, you can specify them here. The format for this input is to specify the minimum, increment, and maximum values separated by a semi-colon. For example, if you specify 10;20, the minimum x-axis scale is set at 10, and the maximum x-axis scale is set at 20. If you specify 10;2;20, then, in addition to minimum and maximum values, the x-axis increment is set at 2. Note that this input is currently disabled, and you cannot change this setting.
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Y Axis: The system will automatically pick a scale for the y-axis. However, if you would like to override that with your values for the y-axis, you can specify them here. The format for this input is to specify the minimum, increment, and maximum values separated by a semi-colon. For example, if you specify 10;20, the minimum y-axis scale is set at 10, and the maximum y-axis is set at 20. If you specify 10;2;20, then, in addition to minimum and maximum values, the y-axis increment is set at 2. Note that this input is currently disabled, and you cannot change this setting.
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Horizontal Lines: If you want to add a few extra horizontal reference lines on top of your chart, you can specify the values here. The format for this input is numeric values separated by semi-colons. For example, if you select 12;15, two horizontal lines are plotted at Y = 12 and Y = 15, respectively. Note that this input is currently disabled, and you cannot change this setting.
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Vertical Lines: You can specify the values here if you want to add a few extra vertical reference lines on top of your chart. The format for this input is numeric values separated by semi-colon. For example, if you specify 2;5, two vertical lines are plotted at X = 2 and X = 5, respectively. Note that this input is currently disabled, and you will not be able to change this setting.

Verify

If you click the Verify button, the software will perform some checks on the data you entered. A sample screenshot of the dialog box is shown in the figure below. Verify The software checks if you have correctly specified the input options and entered the required data on the worksheet. The results of the analysis checks are listed on the right. If the checks are passed, they are shown as green-colored checkmarks. If the verification checks fail, they are shown as a red-colored cross. If the verification checks result in a warning, they are shown in the orange exclamation mark, and finally, any checks that are required to be performed by the user are shown as blue info icons.
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Item: The left-hand side shows the major tabs and the items checked within each section
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Status: The right-hand side shows the status of the checks.
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Overall Status: The overall status of all the checks for the given analysis is shown here. The overall status check shows a green thumps-up sign if everything is okay and a red thumps-down sign if any checks have not passed. Note that you cannot proceed with generating analysis results for some analyses if the overall status is not okay.

Outputs

Click on Compute Outputs to update the output calculations. A sample screenshot of the worksheet is shown below. outputs
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Notes: The text output of the analysis contains the values for the number of data points and groups. It also lists the relative contribution of each of the groups to the total.
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Graphs: The graph shows the Pie chart of the given data set. You can compare the relative size of the pie to determine the biggest contributing factor.

Notes

Here are a few pointers regarding this analysis:
  • You can format the graph using the standard Excel functions. However, note that if you click on Compute Outputs again, you may lose all the formatting you have done to your graph.

Examples

The following examples are in the Examples folder.
  • Create a pie chart for the data in the data file. What is the biggest percentage contribution of the most important factor? (Bar Chart 1.xlsx).


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