@conference {1435138, title = {Prior-free Data Acquisition for Accurate Statistical Estimation}, booktitle = {Proceedings of the 20th ACM Conference on Economics and Computation (EC{\textquoteright}19)}, year = {2019}, url = {https://econcs.seas.harvard.edu/files/econcs/files/chen_ec19.pdf}, author = {Yiling Chen and Shuran Zheng} }