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Table 2 Statistics of our dataset

From: An online-updating algorithm on probabilistic matrix factorization with active learning for task recommendation in crowdsourcing systems

Number of workers 1,592
Number of different tasks 6,639
Number of categories 43
Total HITs from all tasks 19,815
Number of ratings 19,815
Max number of HITs of a worker 2,691
Min number of HITs of a worker 1
Average number of HITs of a worker 12.4
1st quartile (25th percentile) of number of HITs of a worker 1
2nd quartile (50th percentile) of number of HITs of a worker 2
3rd quartile (75th percentile) of number of HITs of a worker 5