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If you have found a fitting instrument that measures your interest and has been validated but is a bit too long, what can you do to shorten it?

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How do you reduce the number of questions within a questionnaire/instrument not the variables? As in, are there any set procedures that one needs to follow. The questionnaire in queestion is the Academic Self-Regulated Learning Scale (Mango 2010). The aim is to reduce it 20 -25 questions.

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    $\begingroup$ Welcome! Is this a general question, or do you have a specific questionnaire in mind? You might get more useful responses in case you mention the specific instrument you are considering. $\endgroup$ – Steven Jeuris Jan 3 at 16:19
  • $\begingroup$ Without more detail, this sounds like you want to perform en.wikipedia.org/wiki/Dimensionality_reduction or en.wikipedia.org/wiki/Feature_selection $\endgroup$ – Justas Jan 5 at 22:43
  • $\begingroup$ @steven jeuris Thanks for the reply. My intention is simply to reduce the number of qyestions within a questionnaire/instrument not my variables and was wondering if there are any set procedures i need to follow. The questionnaire in queestion is the Academic Self-Regulated Learning Scale (Mango 2010). I hope this clarifies what i was asking. Thanks for the tip though, it's interesting. $\endgroup$ – user21242 Jan 7 at 14:52
  • $\begingroup$ @user21242 You can edit your question to incorporate this information. However, you do not seem to have a fixed account (posted as one user, commented as another, and now possibly did a suggested edit as yet another). Is this intentional? Also note, please incorporate the edit into the question, as if you would have written it as such the first time around (i.e., no 'edit' sections that rely on future readers to understand the back and forth in comments). These comments will be removed once edits have been incorporated. $\endgroup$ – Steven Jeuris Jan 7 at 15:31
  • $\begingroup$ @user21242 yes: item-response theory. select the items based on difficulty and discrimination. $\endgroup$ – faustus Jan 8 at 14:52

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