float valueSum(string question)
float valueSum(string question, string|array items)
float valueSum(array variables)
Calculates the sum of the answer codes for all items in a question (e.g. a scale), for selected items, or for a list of variables.
array(2,4,6)
'1-3,5,7
'array('AB01_01', 'AB01_02', 'BB01', 'BC01')
Calculate the sum of all responses in scale AB01.
$sum = valueSum('AB01');
Sum of items 2, 4, 6 and 8 in scale AB01.
$sum = valueSum('AB01', array(2,4,6,8));
Sum of the first 4 items in scale AB01.
$sum = valueSum('AB01', '1-4');
Sum of responses in variables AB01_01, AB01_03 and BB01_02.
$sum = valueSum(array('AB01_01','AB01_03','BB01_02'));
The same command written a little more clearly:
$sum = valueSum( array( 'AB01_01', 'AB01_03', 'BB01_02' ) );