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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