Effort estimation: how valuable is it for a web company to use a cross-company data set, compared to using its own single-company data set?

@inproceedings{mendes-2007-effort, author = {Emilia Mendes and Sergio Di Martino and Filomena Ferrucci and Carmine Gravino}, editor = {Carey L. Williamson and Mary Ellen Zurko and Peter F. Patel-Schneider and Prashant J. Shenoy}, title = {{Effort estimation: how valuable is it for a web company to use a cross-company data set, compared to using its own single-company data set?}}, booktitle = {{Proceedings of the 16th International Conference on World Wide Web, WWW 2007, Banff, Alberta, Canada, May 8-12, 2007}}, pages = {963--972}, publisher = {ACM}, year = {2007}, url = {https://doi.org/10.1145/1242572.1242702}, doi = {https://doi.org/10.1145/1242572.1242702} }