Time-Stratified Sampling for Approximate Answers to Aggregate Queries Joćo Pedro Costa and Pedro Furtado   View Paper (PDF)   Return to Data Warehouse BIBTEX @inproceedings       {DBLP:conf/dasfaa/CostaF03,   author    = {Joćo Pedro Costa and                 Pedro Furtado},    booktitle = {Eighth International Conference on Database Systems for Advanced Applications (DASFAA '03), March 26-28, 2003, Kyoto, Japan},  publisher = {IEEE Computer Society},    title     = {Time-Stratified Sampling for Approximate Answers to Aggregate Queries.},    pages     = {215-222},    year      = {2003},    url       = {db/conf/dasfaa/dasfaa2003.html#CostaF03},    ee        = {http://computer.org/proceedings/dasfaa/1895/18950215abs.htm},    crossref  = {conf/dasfaa/2003},    bibsource = {DBLP, http://dblp.uni-trier.de}  } ©2004 Association for Computing Machinery