Hello Joffm, 

The first 12 equations are defined as mode constant. In the case of your screenshot, the code of the bus is SQ9. So I want to get the value of SQ9 equation which is 25. 

Best,
 

But these 12 equations are wrong.
As I wrote, equations are surrounded by curly brackets.
What you do is only the display of a number.

If you use curly brackets you store a "7" in SQ1. Meaning, you have to write an equation {7}.

Obviously you want to get a certain value depending on the ranking question.
With your idea you could do something like this:
{if(Preference_1.code=="SQ1",SQ1,if(Preference_1.code=="SQ2",SQ2,if(Preference_1.code=="SQ3",SQ3,.....}

But this you can write as 
{if(Preference_1.code=="SQ1",7,if(Preference_1.code=="SQ2",17,if(Preference_1.code=="SQ3",17,.....}

But both is absolutely not necessary.
Instead use assessment values to give each ranking option a certain value.

Joffm

BTW:
If this happens to be one of the yearly surveys about "openbare vervoer" of the TUE, you may ask some of your fellow students who also worked on this in the past.

Thank you for your patient reply. It works!!!
 

Hello Joffm,

Here comes one new question. I want to ask respondents about their mode of accessing public transport (which mode will you use to access the public transport stops?). Then randomly one of their choices will be displayed in the following question. I understand questions and groups can be displayed randomly, but am wondering if it's possible to do the same on the previously chosen question options? 
The lss file is attached below.

Thank you in advance.