====== Randomization: within-subject (Measurement Repetition) ======

Measurement repetitions are used in quite different designs. Here you will find an overview and the appropriate technical solution in each case:


=== Classic Measurement Repetition ===

In a within-subject design, in the simplest case, all respondents receive the same questionnaire. With such a design, all you need to do is duplicate the [[:en:create:question-management|questions or sections]] so that they can display a different question (with the same content, if applicable) for each stimulus.


=== Measurement Repetition with Rotating Sequence ===

It gets a little more challenging when all respondents are given the same stimuli -- but their order is rotated between-subject. How this works you can read here: [[:en:create:rotation]]


=== Measurement Repetition with Part Sets ===

If you want to present only a part of the stimuli to each respondent, you can also use the solutions for [[:en:create:rotation-pages|Rotation of pages]]. In this case, set the random number generator to draw only a certain number of slips in each interview. So for example 3 of 10 stimuli.


=== Work with a Large Number of Stimuli ==

Normally you create a question or a set of questions for each stimuli. For stimulus 1, for example, questions AB01, AB02, and AB03 would be asked. For stimulus 2 the questions BB01, BB02 and BB03. By copying rubrics ([[:en:create:question-management]]) such question sets are quickly duplicated. For a handful of stimuli, this is still reasonably implementable -- but if you have 10, 20, or even more stimuli, it won't give you any more meaningful data sets. In this case you use the [[:en:create:multilevel]].


=== Conjoint-Analysis ===

A special case of within-subject design is a conjoint analysis. To implement such a design, please follow the instructions [[:en:create:randomization-mehrfaktoriell]].