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Among the 450 control HITs, each HIT received 5 or 10 judgments each, as per MTurk's internal mechanism of feeding control HITs to turkers.
The full MTurk study, for collecting judgments for 3004 new HITs and 450 control HITs, cost $1239.15.
We configured this study such that the 450 control HITs accounted for approximately 20% of total HITs.
We not only calculate this for all turkers, but also for prolific turkers (e.g. turkers who worked on more than 50 control HITs, i.e. 50+ Turker Accuracy).
We computed the accuracy of the crowdsourced judgments on the 450 control HITs (gold answers are available) at different levels: First, we computed the judgment-wise accuracy: average accuracy of each judgment against the gold standard.
Within 8 h of posting, we collected 18 775 judgments from 74 workers, and achieved an aggregated accuracy of 96% on 450 control HITs (where gold-standard answers are known), at a cost of $1.75 per drug label.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com