Hi,

I am creating a survey with 18 different subsamples. I randomly allocate respondents using the following equation in an early question group (with question code = cvm),

{rand(1,18)}

The different subsamples will be asked to answer yes or no to a question where values will differ. To simplify, here I exemplify with 6 values according to below (cvm(1,3) corresponds to samples were cvm equal 1, 2, and 3).

cvm	value
(1,3)	35
(4,6)	50
(7,9)	68
(10,12)	10
(13,15)	14
(16,18)	18

I tried to use the equation command (after having read about equations in the LimeSurvey manual ) and included in the following equation in a question group after the one that included "cvm" (with question code = cvmdp),

{if(cvm >= 1 && cvm <, '35'),if(cvm >= 4 && cvm <=6, '50'),if(cvm >= 7 && cvm <=9, '68'),if(cvm >= 10 && cvm <=12, '10'),if(cvm >= 13 && cvm <=15, '14'),if(cvm >= 16 && cvm <=18, '18')}

I then used the tailored question approach by calling on the value in a later question (and later question group than cvmdp) by including {cvmdp} in that question. The space remains empty, though. I would be very grateful for any help on my coding, or hints on how to call on values in questions.

I have used the tailored question approach to call on answers in the survey with success, so that part should work.

Thank you in advance,

Henrik

What LimeSurvey version?

Do you see any errors in the logic file?

What do you see if you leave cvmdp visible?

You should put a test in cvm to check if it's already set. This will prevent resetting on page submission.

I am using Version 3.24.2.

I do not see any errors in the logic file. Both for cvmdp and for the question where I call upon {cvmdp}.

Leaving cvmdp results in an empty question in the question group where cvmpd is include, but the space is still empty in the question were I try to call upon {cvmdp}.

Regarding the test of cvm. Should I do that in the cvm question itself, or in the equation containing cvm in cvmdp question?

Thanks

Henrik

In my opinion your equation is wrong. You are not using the "if" clause correctly.
in Limesurvey if works like this:
{if(condition,then,else)}

So either you create one equation for each case or you need to nest the if conditions. the second if needs to be within the "else" of the first one. You can not just add one if after the other in the same {}

But what could work would be something like this:
Aproach ine
I hope I have added enought ))) at the end...

The other option is a bit easier to read:
Not sure if you need to add an empty "else" for each. But I think in the newer versions this is not required anymore.

What worries me a bit, that Tpartner didn't see this. Either he really didn't spot it or I am not up to date...

And you can simplify the equation to
{if(cvm <, '35',if(cvm <=6, '50',if(cvm <=9, '68',if(cvm <=12, '10',if(cvm <=15, '14','18')))))}
Because of the syntax of the IF-statement
{if(condition,then,else)}
it is not necessary to check again the already checked parts.

If the first condition fails, the value of cvm IS greater or equal 4; so nop need to check again.

Joffm

Thanks Holch!

I used your first suggestion and it worked. My bad not understanding the if in LimeSurvey.

Thanks again!

Henrik

Thanks Joffm,

that indeed makes the coding more efficient.

Henrik

of course Joffm's version is the cleaner and simpler one. I would go with his approach.