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First ACM International Conference on Web Search and Data Mining - WSDM 2008

Characterizing and Understanding the Impact of Temporal Evolution on Document Classification

author: Wagner Meira Jr., University of Rochester

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*Slides*
0:00	Understanding Temporal Aspects in Document Classification
0:15	Introduction
1:44	- Overview
2:37	- Class Distribution
3:30	- Term Distribution - 1
4:00	- Class Similarity - 1
4:48	- Trade-off
6:05	- Overview
6:51	- Analysis
7:35	- Experimental Setup
8:53	- Assessing the Sampling Effect
9:29	- Assessing Overall Temporal Effects
11:51	- Accuracy as a Function of Time Distance
14:04	- Class Distribution - 1
14:42	- Class Distribution - 2
15:19	- Term Distribution - 2
16:34	- Term Distribution - 3
17:51	- Class Similarity - 2
18:42	Exploiting the Temporal Effects
19:26	- Window Size × Training Sample Size
20:04	- Window Size × Accuracy
21:01	- Optimum Window Size per Year
21:41	- Optimum Window Size × Accuracy
22:18	Conclusions
23:07	- Questions
25:53	- Questions

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