Standard Deviation as a Query Hardness Estimator.

@inproceedings{pereziglesias-2010-standard, author = {Joaqu\'{i}n P\'{e}rez-Iglesias and Lourdes Araujo}, editor = {Edgar Ch\'{a}vez and Stefano Lonardi}, title = {{Standard Deviation as a Query Hardness Estimator}}, booktitle = {{String Processing and Information Retrieval - 17th International Symposium, SPIRE 2010, Los Cabos, Mexico, October 11-13, 2010. Proceedings}}, series = {Lecture Notes in Computer Science}, volume = {6393}, pages = {207--212}, publisher = {Springer}, year = {2010}, url = {https://doi.org/10.1007/978-3-642-16321-0_21}, doi = {https://doi.org/10.1007/978-3-642-16321-0_21} }