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Spatial Analysis of News Sources Andrew Mehler, Steven Skiena, Yunfan Bao, Xin Li, Yue Wang Stony Brook University www.textmap.com.

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Presentation on theme: "Spatial Analysis of News Sources Andrew Mehler, Steven Skiena, Yunfan Bao, Xin Li, Yue Wang Stony Brook University www.textmap.com."— Presentation transcript:

1 Spatial Analysis of News Sources Andrew Mehler, Steven Skiena, Yunfan Bao, Xin Li, Yue Wang Stony Brook University

2 Computational News Analysis Lydia: Large scale newspaper analysis. Obtain data on how the volume of news coverage varies by location. Our paper describes how we calculate, display, and evaluate spatial bias in news sources.

3 Who Is Running For President? Stony Brook University

4 Mark Foley Scandal

5 Who is Looking for a Manager?

6 Steve Nashs Teams

7 Lydia (textmap.com) Data-maps are a component of the Lydia system. The data generated from the Lydia system drives the data-map creation. Monitors ~1000 newspapers every day and also other sources. Components of Lydia include….

8 Named Entity Recognition Saddam Husseins chief lawyer warned Sunday of worsening violence in Iraq and chaos across the Mideast if the ex-president is sentenced to death at his trial for a crackdown on a Shiite Muslim village in the 1980s. Khalil al-Dulaimi also said he would break a month long boycott and attend proceedings Monday when Saddam's second trial resumes on separate charges of genocide against the Kurds.

9 Segmentation and Classification Saddam Husseins chief lawyer warned Sunday of worsening violence in Iraq and chaos across the Mideast if the ex-president is sentenced to death at his trial for a crackdown on a Shiite Muslim village in the 1980s. Khalil al-Dulaimi also said he would break a month long boycott and attend proceedings Monday when Saddam's second trial resumes on separate charges of genocide against the Kurds.

10 Favorite Things

11 Social Network

12 Juxtaposition Analysis

13 Article Categorization

14 Related Work Visualizing Data (Tufte) Geographic Visualization (Slocum, McMaster, Kessler, Howard) Data Maps / Color Schemes (Brewer) Quantitative Geography (Fotheringham, Brunsdon, Charlton) Spatial Data-Mining (Miller, Han) Spatial Interpolation / Smoothing (Fuentes, Stein)

15 Outline of this Talk News/Data Acquisition Source-Influence Modeling Spatial Visualization Identification of Spatially Biased Maps Conclusions

16 News Acquisition Spiders - Programs that crawl a web domain and download all of the pages. Universal Spider built using wget. Still need customization Cookies / Logins Page Structure / formatting / Advertisements Each paper ~ MB in minutes. ~800 U.S. papers and ~300 foreign papers. Duplicate Articles? Syndication, Persistence, Ongoing Stories

17 Duplicate Detection Despite playing without three injured defensive starters and losing another early, the Giants held Tampa Bay to 174 total yards and set up a score with a turnover deep in Buccaneers' territory in a 17-3 victory Sunday that gave New York its fourth straight win. Despite playing without three injured defensive starters and losing another early, the Giants held Tampa Bay to 174 total yards and set up a score with a turnover deep in Buccaneers' territory in a 17-3 victory Sunday.

18 Despite playing without three injured defensive starters and losing another early, the Giants held Tampa Bay to 174 total yards and set up a score with a turnover deep in Buccaneers' territory in a 17-3 victory Sunday that gave New York its fourth straight win. Despite playing without three injured defensive starters and losing another early, the Giants held Tampa Bay to 174 total yards and set up a score with a turnover deep in Buccaneers' territory in a 17-3 victory Sunday. Character Windows

19 Despite playing without three injured defensive starters and losing another early, the Giants held Tampa Bay to 174 total yards and set up a score with a turnover deep in Buccaneers' territory in a 17-3 victory Sunday that gave New York its fourth straight win. Despite playing without three injured defensive starters and losing another early, the Giants held Tampa Bay to 174 total yards and set up a score with a turnover deep in Buccaneers' territory in a 17-3 victory Sunday. Most Windows Equal in Duplicates

20 Document 1: 17, 29, 113, 30, 25, 10, 130, 128, 50, 119, 190, 1979 Document 2: 17, 29, 113, 30, 25, 10, 130, 128, 50 Hash Codes For Windows

21 Document 1: 17, 29, 113, 30, 25, 10, 130, 128, 50, 119, 190, 1979 Document 2: 17, 29, 113, 30, 25, 10, 130, 128, 50 Size Reduction

22 Document 1: 17, 29, 113, 30, 25, 10, 130, 128, 50, 119, 190, 1979 Document 2: 17, 29, 113, 30, 25, 10, 130, 128, 50 Size Reduction

23 Outline of this Talk News/Data Acquisition Source-Influence Modeling Spatial Visualization Identification of Spatially Biased Maps Conclusions

24 Combining News Influence How do we combine all the newspapers that are read in an area? In Bloomsburg, PA people might read The New York Times The Philadelphia Inquirer The Bloomsburg Press Enterprise What Is Reflective of Bloomsburgs Interests?

25 Linear Decay Model Bloomsburg NY Times Philadelphia

26 Influence Model To estimate the contributions of different sources, we develop an influence model. The influence is a function on cities and sources, quantifying how influential a source is in a particular city. Influence(New York Times, Baltimore) = ? The frequency of reference estimate for a city is then a weighted average over the sources. F(Knicks, NY) = F(Knicks,s)*influence(s,NY) / influence(s,NY)

27 Readership Estimate The readership of a paper is estimated by combining the papers circulation with its alexa.com rpm (reach per million). We can then estimate the radius of a newspapers influence by making 10% of the population covered equal the readership. The influence function decays linearly with distance from the source, and 0 outside its radius of influence. Big papers have a larger influence than small papers. Potential readership base not a factor. Is linear decay the right model? Some large papers have national distributions.

28 Outline of this Talk News/Data Acquisition Source-Influence Modeling Spatial Visualization Identification of Spatially Biased Maps Conclusions

29 Visualization Issues Representing United States Surface Triangle (Shewchuk) used to create a Delauney triangulation of the cities. Interpolating Surface from Point Data (cities)

30 Visualization Mesa/openGl used to render maps. Relative color scale, max heat hottest red.

31 Absolute Color Scale 2 maps directly comparable

32 Outline of this Talk News/Data Acquisition Source-Influence Modeling Spatial Visualization Identification of Spatially Biased Maps Conclusions

33 Which Maps are Interesting? How can we Identify the Terms With A Geographic Bias? Dont want to look through all 200,000 entities! How do we Quantify Geographic Bias?

34 Variance Analysis Our Analysis Gives frequency estimates for 25,374 cities. We defined 2 measures based on variance. Variance: The variance of the 25,374 values. Weighted Variance: The variance divided by the mean. Var: 7.06e-09 W-Var: 7.11e-05 Var: 6.24e-07 W-Var: 3.00e-03 Cant distinguish a bipolar map from a checkerboard map.

35 Component Analysis Consider what happens to the number of connected components if you only consider cities above a certain value.

36 Component Analysis Consider what happens to the number of connected components if you only consider cities above a certain value.

37 Component Analysis Consider what happens to the number of connected components if you only consider cities above a certain value.

38 Component Analysis In a biased map, we expect the largest values to be clustered together.

39 Component Analysis In an unbiased map, we expect many random clusters of high heat. Not the single cluster we expect in biased maps.

40 Component Measures Largest Gap: The value of the largest gap. A large gap suggests the entity is drawn from 2 different distributions, local and national. Weighted Gap: Largest divided by max. Percentage Gap: Percentage Change.

41 Evaluating Bias Measures To evaluate the measures, we made 4 sets of data maps…

42 Random Entity: Uniform

43 Random Entity: Binomial

44 Unbiased Entity

45 Biased Entity

46 Results Data Set Size 400 biased 128 unbiased 200 uniform 200 binomial

47 Discriminating Real Data

48 Future Work Improved Map visualization Sentiment Data Maps. Animated maps showing temporal changes in popularity. Improved influence models. Empirical justifications of models. Improved bias estimators.


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