Picking one item per group and randomizing order

[shinyili]

Hi, working on an experiment right now that is structured so that each trial is based off of a different article, but there are multiple possible trials for each article and each participant should only see 1 trial per article. Then, the order of the articles should also be randomized. My csv file looks like this currently:

“article_id”,”arr_id”,”c1″,”text1″,”next1″,”c2″,”text2″,”next2″,”c3″,”text3″,”next3″
1,1,1,”a”,”b”,2,”ab”,”c”,3,”abc”,”d”
1,2,1,”a”,”b”,4,”abcd”,”e”,5,”abcde”,”f”
1,3,2,”ab”,”c”,4,”abcd”,”e”,5,”abcde”,”f”
2,1,1,”t”,”u”,2,”tu”,”v”,4,”tuvw”,”x”
2,2,2,”tu”,”v”,3,”tuv”,”w”,5,”tuvwx”,”y”
2,3,1,”t”,”u”,4,”tuvw”,”x”,5,”tuvwx”,”y”

Basically, in this case, only 2 trials should be run with 1 from article_id 1 and one from article_id 2. There will be more articles added to the file, and each article might have a different number of arrangements. I’m having trouble getting the experiment to only pick one trial per article right now, as it is giving me all 6 in random order. Is there some specific sequencing I should be doing or a different way of structuring the file? If possible, I would also like to balance the distribution so that each arrangement is picked roughly the same amount of times. Thank you!

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