In StoryTeller charts the option for hiding results with low bases or warn when the base is too low in available under Series settings.
Below are example screenshots, as you see a text is shown in the bottom of the chart that either warns for a low base or explains that some results have been hidden due to a low base. Both Warn and Hide can be used at the same time, for instance results with a base less than 5 are hidden and result with a base between 5 and 10 are shown but with a warning for low base. The limits are freely defined during the setup and can be based on weighted or un-weighted respondent counts.
Example image 1; a base size warning is used in a time chart, as shown week 52, 1, 2, 5, 6 and 8 has a low base.
Example image 2; result with low base is hidden.
Both ‘Hide’ and ‘Warn’ can be used at the same time the Hide has the highest priority. So a series with a base 4 will be hidden if the limit for hiding is 5 and the limit for warn is 7.
The settings for hiding or warning for results (series) with a low base can be specified on the questions level or on custom on a chart level (not on a report level). In the setup the following selections must be done:
- Select if you want to Hide or Warn
- Select if you would like to use the base sizes specified in questions or a custom respondent limit
- Select if the limit should be based on Weighted or un-weighted respondent count
- Define if the axis text of the hidden series should remain or be removed (see example images below)
- Enter an information text to show in the bottom of the chart, the text is only shown when at least one series has been hidden.
The two example images below refer to point 3 in the list above. One variable has a low base and thus those results are not shown. In the right chart the axis text is still shown and in the left chart the axis text has been removed.
A default “Hide base text” can be defined in the Project settings page, the text entered in the Base size warning text field in the Project settings page will be default when setting up a new chart. The text can be changed per chart during the setup.
The image below highlights the default text in the Project settings page.
The settings for warning for low base sizes are done on a chart level too (not on a report level). In the setup the following selections must be done:
- The respondent limit.
- Select if the limit should be based on weighted or un-weighted respondent count
- Enter an information text to show in the bottom of the chart, the text is only shown when at least one series has a low base
The image below shows the setup controls in the Settings Tab.
A default “Warn base text” can be defined in the Project settings page. The default text will be used in all new charts, unless it is edited in the chart setup.
The series with low base are indicated with an * in the charts as shown in the example images above. The * is shown in different positions depending on the content in the chart, the following logic is used:
- Indicated in the Question text (as shown in chart 1 and 2 below) if; a. no Filter compare or Time period compare (day, week, month, quarter, year) is present
- Indicated in the Filter/Time period compare text (as shown in chart 3 below) if; a. compare in Filters or Time period comparison is present
- Indicated in the series (as shown in chart 4 below) if; a. Multiple questions and multiple answers and either Filter compare or Time periods comparison is present b. If Filter Compare and Time period comparison is present c. If Filter Compare is selected in two or more filters
Some example images of * position are shown below, the numbers refer to the list above.
If the text where the * is shown is not displayed in the chart (texts can be hidden during chart setup) the * will not be shown at all, though the message will still be shown below the chart. In the example below the * is shown in Question text but the question text is hidden and thus not shown in the chart.
The example below shows a chart with low base, the * is shown in the question text but the question text is hidden.