Long stacking did fix the problem!
After investigating this approach a question as to whether the example was from a randomized Qualtrics survey. If so, what is the Survey Flow and where are the Flow ID variables? This also appears to accomplish a Split File operation except groups on records versus a variable classification.
This sounds like it will do the trick - but where do I find the Data Stacking command in SPSS 25?
Does anyone have a R package that will do this?
Will do - thanks again.
That's it :) Okay thanks! Wouldn't happen to know what these things cost would you?
Thanks for these pages - they were very helpful. If I am understanding these correctly in Qualtrics "blocks" are sets of questions that can be used for "looping and merging" in a survey. My reference to "blocks" are a subset of concepts (or any treatment stimuli) selected based on an experimental design. My survey questions are the same for all respondents and all concepts in a fixed order. So if Qualtrics does not select stimuli based on an experimental design to structure a set of surveys, the stimulus sets would have to be determined ahead and “piped in” from the design matrix for which the “block” of set questions would be “looped and merged.” As long as the design-determined number of individual surveys were run based on the “concept blocks,” would this work?
So loop will create X number of unique blocks/surveys of five randomly selected concepts from the 15 and randomization will randomly order the concepts within a block/survey so that it is as if all respondents evaluated all concepts with a n=30 for a single concept - right?
Dear bansalpeeyush29, Thank you very much for your reply. I do want to randomize concepts within a block, but not randomize blocks within a single survey. I have attached a fuller description of the research project. I look forward to your ideas and recommendations. Regards, Bill
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