valueMean()

float valueMean(string question)

float valueMean(string question, string|array items)

float valueMean(array variables)

Calculates the mean (average, expectation value) of the answer codes for all items in a question (e.g. a scale), or for a list of variables.

• question – ID of a question (as a string)
• items – A list (string or array) of items
• variables – A list (array) of variable IDs as stated in the Variables Overview

Note This works in the same way as valueSum() – the parameters are described in detail in this chapter with various examples.

In the following example, question “AB02” will be displayed if the mean in the scale “AB01” is at least 1.5.

$mean = valueMean('AB01');
if ($mean >= 1.5) {
  question('AB02');
}