Randomize Within Group (Experiment File)


Randomly orders and presents all files sharing the same RWG value.


Any positive integer value


To randomly order and present certain files in your experiment, assign the files you want to have randomized with the same number in this field. For example, if you have five files you want randomized, assign them each an RWG value of 1. The five files will be randomly presented in the five positions they occupy in the experiment. All remaining files will be presented in their normal positions as long as their RWG value is either 0 or none. You can independently randomize another group of items by assigning them all a 2, another group with 3s and so forth.


In one condition, you want to present 1) Word document, 2) five images randomly ordered, 3) five sounds randomly ordered, and 4) a final Word document. Assign an RWG value of "0" or none to the Word documents to keep them where they are, a "1" to the five images, and "2" to the five sounds. That's it. To randomize the order that groups of files are presented (e.g., whether the images or the sounds are presented first),see Randomize Between Groups .


Use of the RWG field in the experiment files randomizes the order of questionnaires and related files, whereas using the RWG field in the questionnaire files randomizes the presentation of items that generate the actual data.  Thus, use this functionality when you want to randomize the higher-level elements of your experiment, the questionnaires themselves.