Follow the instructions in “Example of the Distribution Platform” on page 33 to produce the report shown in Figure 3.5.
Freq Assigns a frequency variable to this role. This is useful if you have summarized data. In this instance, you have one column for the Y values and another column for the frequency of occurrence of the Y values. The sum of this variable is included in the overall count appearing in the Summary Statistics report (represented by N). All other moment statistics (mean, standard deviation, and so on) are also affected by the Freq variable.
By Produces a separate report for each level of the By variable. If more than one By variable is assigned, a separate report is produced for each possible combination of the levels of the By variables.
Histograms Only Removes everything except the histograms from the report window.
Table 3.1 Description of the Distribution Launch Window (Continued)
Figure 3.5 The Initial Distribution Report Window
Note: Any rows that are excluded in the data table are also hidden in the histogram.
The initial Distribution report contains a histogram and reports for each variable. Note the following:
• To replace a variable in a report, from the Columns panel of the associated data table, drag and drop the variable into the axis of the histogram.
• To insert a new variable into a report, creating a new histogram, drag and drop the variable outside of an existing histogram. The new variable can be placed before, between, or after the existing histograms.
Note: To remove a variable, select Remove from the red triangle menu.
• The red triangle menu next to Distributions contains options that affect all of the variables.
See “Distribution Platform Options” on page 44.
• The red triangle menu next to each variable contains options that affect only that variable.
See “Options for Categorical Variables” on page 45 or “Options for Continuous Variables”
on page 47. If you hold down the CTRL key and select a variable option, the option applies to all of the variables that have the same modeling type.
• Histograms visually display your data. See “Histograms” on page 38.
• The initial report for a categorical variable contains a Frequencies report. See “The Frequencies Report” on page 41.
• The initial report for a continuous variable contains a Quantiles and a Summary Statistics report. See “The Quantiles Report” on page 41 and “The Summary Statistics Report” on page 41.
Histograms
Histograms visually display your data. For categorical (nominal or ordinal) variables, the histogram shows a bar for each level of the ordinal or nominal variable. For continuous variables, the histogram shows a bar for grouped values of the continuous variable.
Table 3.2 Histogram Actions
Highlighting data Click on a histogram bar or an outlying point in the graph.
The corresponding rows are highlighted in the data table, and corresponding sections of other histograms are also
highlighted, if applicable. See “Highlight Bars and Select Rows” on page 40.
Creating a subset Double-click on a histogram bar, or right-click on a histogram bar and select Subset. A new data table is created that contains only the selected data.
Resizing the entire histogram
Hover over the histogram borders until you see a
double-sided arrow. Then click and drag the borders. For more details, see the Using JMP book.
Rescaling the axis (Continuous variables only) Click and drag on an axis to rescale it.
Alternatively, hover over the axis until you see a hand. Then, double-click on the axis and set the parameters in the Axis Specification window.
Resizing histogram bars (Continuous variables only) There are multiple options to resize histogram bars. See “Resize Histogram Bars for Continuous Variables” on page 39.
To see additional options for the histogram or the associated data table:
• Right-click on a histogram. See the Using JMP book.
• Click on the red triangle next to the variable, and select Histogram Options. Options are slightly different depending on the variable modeling type. See “Options for Categorical Variables” on page 45 or “Options for Continuous Variables” on page 47.
Resize Histogram Bars for Continuous Variables
Resize histogram bars for continuous variables by using the following:
• the Grabber (hand) tool
• the Set Bin Width option
• the Increment option Use the Grabber Tool
The Grabber tool is a quick way to explore your data.
1. Select Tools > Grabber.
Note: (Windows only) To see the menu bar, you might need to hover over the bar below the window title. You can also change this setting in File > Preferences > Windows Specific.
2. Place the grabber tool anywhere in the histogram.
3. Click and drag the histogram bars.
Think of each bar as a bin that holds a number of observations:
• Moving the hand to the left increases the bin width and combines intervals. The number of bars decreases as the bar size increases.
• Moving the hand to the right decreases the bin width, producing more bars.
• Moving the hand up or down shifts the bin locations on the axis, which changes the contents and size of each bin.
Use the Set Bin Width Option
The Set Bin Width option is a more precise way to set the width for all bars in a histogram. To use the Set Bin Width option, from the red triangle menu for the variable, select Histogram Options > Set Bin Width. Change the bin width value.
Specifying your selection Specify the data that you select in multiple histograms. See
“Specify Your Selection in Multiple Histograms” on page 40.
Table 3.2 Histogram Actions (Continued)
Use the Increment Option
The Increment option is another precise way to set the bar width. To use the Increment option, double-click on the axis, and change the Increment value.
Highlight Bars and Select Rows
Clicking on a histogram bar highlights the bar and selects the corresponding rows in the data table. The appropriate portions of all other graphical displays also highlight the selection.
Figure 3.6 shows the results of highlighting a bar in the height histogram. The corresponding rows are selected in the data table.
Tip: To deselect histogram bars, press the CTRL key and click on the highlighted bars.
Figure 3.6 Highlighting Bars and Rows
Specify Your Selection in Multiple Histograms
Extend or narrow your selection in histograms as follows:
• To extend your selection, hold down the SHIFT key and select another bar. This is the equivalent of using an or operator.
• To narrow your selection, hold down the ALT key and select another bar. This is the equivalent of using an and operator.
Related Information
• “Example of Selecting Data in Multiple Histograms” on page 66
Select a bar to highlight rows and parts of other output.