rates vary from $2500/wk to $10k/wk. Rule of thumb is "Have an annual salary in mind for a similar role, chop off the last three zeros, and that's my hourly rate.", based on estimate of 1000 billable hours per year
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I. Nagy, R. Farkas, and M. Jelasity. Proceedings of the 2009 Workshop on Text and Citation Analysis for Scholarly Digital Libraries, page 1--9. Stroudsburg, PA, USA, Association for Computational Linguistics, (2009)
M. Wu, R. Faris, and K. Ma. Proceedings of the 2013 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, page 779--786. New York, NY, USA, ACM, (2013)