We consider the heavy-hitters and F_p moment estimation problems in the sliding window model. For F_p moment estimation with 1 < p ≤ 2, we show that it is possible to give a (1± ε) multiplicative approximation to the F_p moment with 2/3 probability on any given window of size n using Õ(1/(ε^p)log² n + 1/(ε²)log n) bits of space. We complement this result with a lower bound showing that our algorithm gives tight bounds up to factors of log log n and log1/(ε). As a consequence of our F₂ moment estimation algorithm, we show that the heavy-hitters problem can be solved on an arbitrary window using O(1/(ε²)log² n) space which is tight.
@InProceedings{feng_et_al:LIPIcs.ICALP.2025.75, author = {Feng, Shiyuan and Swartworth, William and Woodruff, David}, title = {{Tight Bounds for Heavy-Hitters and Moment Estimation in the Sliding Window Model}}, booktitle = {52nd International Colloquium on Automata, Languages, and Programming (ICALP 2025)}, pages = {75:1--75:19}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-372-0}, ISSN = {1868-8969}, year = {2025}, volume = {334}, editor = {Censor-Hillel, Keren and Grandoni, Fabrizio and Ouaknine, Jo\"{e}l and Puppis, Gabriele}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICALP.2025.75}, URN = {urn:nbn:de:0030-drops-234524}, doi = {10.4230/LIPIcs.ICALP.2025.75}, annote = {Keywords: sketching, streaming, heavy hitters, sliding window, moment estimation} }
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