Hi,
the first advice is:
Read the maual
[url]
www.limesurvey.org/manual/LimeSurvey_Manual
[/url]
You already answered your question."by random".
In this chapter of the manual
[url]
www.limesurvey.org/manual/ExpressionScri...mplemented_functions
[/url]
you find the function "rand(x,y)" to generate a random number between x and y.
So you have generate a random number between 1 and 2.
This is done in a question of type "equation" (Here I call it "random")
[url]
www.limesurvey.org/manual/Question_type_-_Equation/en
[/url]
Here the function is entered surrounded by curly brackets
{rand(1,2)}
But wait:
As you might know from EXCEL a random number function changes its value with each click.
To avoid this, we use this
{if(is_empty(random),rand(1,2),random)}
Meaning: If the random number is still empty, use the function to create one, otherwise leave it as it is.
Now you have variable called "random".
And you split your sets by entering either "random==1" or "random==2" into the field "conditions" of "General settings"
Joffm
Coming back to your question for "tutorials".
There are some sample surveys here
[url]
www.limesurvey.org/manual/ExpressionScript_sample_surveys/en
[/url]
which you can download and import.
And they are also included in the demo installation of LimeSurvey
[url]
demo.limesurvey.org/admin
[/url]
