Modify Footers - Add Footer Showing Smallest Sample Size on Table

This rule adds a footer showing the smallest sample size on the table (using Column n).

Example

Smallest sample size: 15 observations.

Technical detail

Prior to 3 September 2014, this rule shows the smallest [n] on a table.

How to apply this rule

For the first time in a project

Select the table(s)/chart(s) that you wish to apply the rule to.
Start typing the name of the Rule into the Search features and data box in the top right of the Q window.
Click on the Rule when it appears in the QScripts and Rules section of the search results.

OR

Select Automate > Browse Online Library.
Choose this rule from the list.

Additional applications of the rule

Select a table or chart that has the rule and any table(s)/chart(s) that you wish to apply the rule to.
Click on the Rules tab (bottom-left of the table/chart).
Select the rule that you wish to apply.
Click on the Apply drop-down and choose your desired option.
Check New items to have it automatically applied to new items that you create. Use Edit > Project Options > Save as Template to create a new project template that automatically uses this rule.

Removing the rule

Select the table(s)/chart(s) that you wish to remove the rule from.
Press the Rules tab (bottom-right corner).
Press Apply next to the rule you wish to remove and choose the appropriate option.

How to modify the rule

Click on the Rules tab (bottom-left of the table/chart).
Select the rule that you wish to modify.
Click Edit Rule and make the desired changes. Alternatively, you can use the JavaScript below to make your own rule (see Customizing Rules).

JavaScript

includeWeb('QScript Utility Functions');
includeWeb('Table JavaScript Utility Functions'); 

excludeRTables();

if (table.availableStatistics.indexOf('Column n') === -1)
{
    let statistic_name = inDisplayr() ? 'Sample Size' : 'n';
    form.ruleNotApplicable('This rule only applies to tables with the Column ' + statistic_name + ' statistic');
}
//Create form
form.setSummary('Add a footer with the smallest sample size on the table');
form.setHeading('Add Footer Showing Smallest Sample Size on Table');
let stat_name = table.getTranslation('Column n');
let description = form.newLabel('Adds a footer showing the smallest smaple size on the table (using ' + stat_name + ')');
form.setInputControls([description]);

//Apply rule
let column_ns = table.get('Column n');// Get the Column N statistics.

let smallest_size = column_ns [0][0];// Keep track of the smallest size.
for (let row = 0; row < table.numberRows; row++)
   for (let col = 0; col < table.numberColumns; col++)
        smallest_size = Math.min(smallest_size, column_ns [row][col]);
table.extraFooters = ['Smallest sample size: ' + smallest_size + ' observations.'];