I have a really long survey that is actually broken into two halves. After the first few questions, I need to assign someone to the first half or second half.

Basically it will work like this:

if (st1=3 or st1=4 or st4_2 >= 1) then they are automatically assigned the first half, otherwise I need to have them randomly assigned into either

so I'm guessing that some sort of equation is in order, I think this will do it, but I can use some extra eyes:

{if((st1.NAOK=||st1.NAOK==4||st4_2.NAOK >= 1),1,floor(rand(1,2.999)))}


Does anyone see any flaws in my idea or in my equation?

in testing so far, I am running into the following issue: the equation above sometimes spits out the number "3"

I don't understand the use of floor().

How about this:
That should return 1 if st1.NAOK= OR st1.NAOK==4 OR st4_2.NAOK >= 1. Otherwise it will return a random number 1 or 2.

tpartner wrote: I don't understand the use of floor()

Typical rand routines in many programming-languages are not returning whole numbers.
Not the issue with php rand(), which is returning integer.

Other reason was the distribution of random number between two numbers.
The typical concept often used than was this:

In the old days the random routines where not that random.
PHP 7.X has changed the underlaying routine.

Compare notes in this bugticket:
bugs.limesurvey.org/view.php?id=12248

after testing, it looks as though floor isn't needed, and rand does return an integer

Thanks!