Dear all,

I am looking for a reference on a very trivial topic (as I thought at the beginning), but I can't find. I want to say in a paper I write that a choice of a measurement instrument might influence the results: for example, if I explore differences between two groups, I might find differences if I use questionnaire X and I might find no differences if I use questionnaire Y. Simple, but can't find a reference on that. Any thoughts?

Thank you in advance,

Marina

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