Stratified sampling based on value of 10-item factor

Hi @fhens,
as soon as your responses are submitted, you can access them using piped text from JavaScript. You can convert these values to numbers and do any math operations with them and determine if the value is high or low. Then you could branch your survey according to this embedded field and assign each branch separately to your groups.
However, this version doesn't take into account that high self-esteem respondents could leave survey with a higher probability if they're in one particular group. I don't know how likely is this since I don't know your survey. On the other hand, if you realize, that this happens, you can change the likelihood to be assigned to particular groups using "edit counts" (see manual for randomizers).

Nevertheless, if you'd like to use my suggestions, you could use something like this:

1) Javascript to get whether the is low or high
Add the following JavaScript to some question which is on some pages after the last self-esteem is answered, but before the first branching (see the Surve flow below). (If you need to do it on the same page where the last question was answered, it is also possible, but much more complicated.)

Qualtrics.SurveyEngine.addOnload(function()
{
var E = Number("${q://QID14/SelectedChoicesRecode}") + Number("${q://QID15/SelectedChoicesRecode}");

var esteem = (E >= 5) ? "high":"low";

Qualtrics.SurveyEngine.setEmbeddedData( "esteem", esteem );

});

The first line: an example of how to compute something based on questions answers; modify it such that you compute self-esteem.
The second line: set whether self-esteem is high or low using a given threshold
The third line: send the "low"/"high" value into the embedded field to future use in branching.


Note: if your questions are of a different type than multiple choice, the form of the corresponding piped text will be different. If you aren't sure what the form is, click on "Piped text" while editing some question, select the one you need and copy it to the proper place of the JavaScript.


2) Survey flow with proper randomizers and branching

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Note: Block1 should not be there twice, block names are random here, just as an example.