Hi,
I have Array (10 point choice) question q01 (it is code of question) with two subquestions SQ001 and SQ002.
SQ001: How much money You have?
SQ002: How much money You want?

How should look equation to calculate how much money someone need to earn?

SQ001: How much money You have? Answer=1
SQ002: How much money You want? Answer=5

You need (SQ002-SQ001) $4

Hi,
if you read the manual
www.limesurvey.org/manual/Expression_Man...code_variable_naming

In the first line you see
Here are the details of how to construct a Qcode (and access some properties) by question type. In general, Qcodes are constructed as:

QuestionCode . '_' . SubQuestionID . '_' . ScaleId


Example of 10-point array in the second row: {Q2_L2}
QuestionCode_SubQuestionID

So in your case:
{q01_SQ002.NAOK-q01_SQ001.NAOK}

Best regards
Joffm

Thank You Joffm!!!