Rationale Methodology Dataset Results Intertemporal topic correlations in online media A comparative study on weblogs and news websites Jean-Philippe Cointet*, Emmanuel Faure*, Camille Roth** *CREA, CNRS/Ecole Polytechnique, Paris, France **CRESS, Department of Sociology, University of Surrey, Guildford, UK March 28, 2007 — First ICWSM, Boulder, Col., USA
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did?
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 1
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 2
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 3
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 4
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 5
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 6
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 7
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 8
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 9
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 10
Rationale Methodology Dataset Results Context Mimicking behaviors Are there some regularities in the manner in which some group(s) of agents address and discuss issues, after some other group(s) of agents did? press blogs t = 11
Rationale Methodology Dataset Results Context Intertemporal correlations We are interested in generalized patterns of intertemporal topic correlations between various information sources
Rationale Methodology Dataset Results Context Intertemporal correlations We are interested in generalized patterns of intertemporal topic correlations between various information sources Weaker hypothesis: bloggers are part of a larger system of which they are an “easily” observable sample.
Rationale Methodology Dataset Results Context Intertemporal correlations We are interested in generalized patterns of intertemporal topic correlations between various information sources Weaker hypothesis: bloggers are part of a larger system of which they are an “easily” observable sample. Global, macro-level viewpoint Realism of studying information blogs links diffusion within blog networks personal links (systems) questionable in some media links instances...
Rationale Methodology Dataset Results Context Intertemporal correlations We are interested in generalized patterns of intertemporal topic correlations between various information sources Weaker hypothesis: bloggers are part of a larger system of which they are an “easily” observable sample. Global, macro-level viewpoint Realism of studying information blogs links diffusion within blog networks personal links (systems) questionable in some instances...
Rationale Methodology Dataset Results Context Intertemporal correlations We are interested in generalized patterns of intertemporal topic correlations between various information sources Weaker hypothesis: bloggers are part of a larger system of which they are an “easily” observable sample. Global, macro-level viewpoint Realism of studying information blogs links diffusion within blog networks (systems) questionable in some instances...
Rationale Methodology Dataset Results Context Intertemporal correlations We are interested in generalized patterns of intertemporal topic correlations between various information sources Weaker hypothesis: bloggers are part of a larger system of which they are an “easily” observable sample. Global, macro-level viewpoint ...but we may always focus on Realism of studying information dynamic patterns by creating a diffusion within blog networks map of systematic topic (systems) questionable in some correlations instances...
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Context press blogs α blogs γ blogs β
Rationale Methodology Dataset Results Causal-states models Signal press 0 0 1 1 1 1 1 0 0 0 0 ... blogs 0 0 0 0 1 1 1 1 1 1 0 ...
Rationale Methodology Dataset Results Causal-states models Signal press 0 0 1 1 1 1 1 0 0 0 0 ... blogs 0 0 0 0 1 1 1 1 1 1 0 ... signal a a b b c c c d d d a ...
Rationale Methodology Dataset Results Causal-states models Signal press 0 0 1 1 1 1 1 0 0 0 0 ... blogs 0 0 0 0 1 1 1 1 1 1 0 ... signal a a b b c c c d d d a ... Reconstructing a state-based dynamics b|.5 c|.5 d|.33 1 2 3 4 a|.5 b|.5 c|.67 d|.67 a|.33
Rationale Methodology Dataset Results Causal-states models More complicated signal and alphabet... blogs α 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 blogs β 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 blogs γ 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 press 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 alphabet a b c d e f g h A B C D E F G H signal ...A H H f d c a e F f b c b d e F... press press press · · · → → → → · · · blogs α blogs α blogs α blogs γ blogs γ blogs γ blogs β blogs β blogs β
Rationale Methodology Dataset Results Causal-states models Causal-state machine (Crutchfield & Young, 1989; Shalizi, 2001) automatically inferring (variable-length) hidden states... ...made of equivalence classes of signal histories... ...along with transition probabilities.
Rationale Methodology Dataset Results Causal-states models Causal-state machine (Crutchfield & Young, 1989; Shalizi, 2001) automatically inferring (variable-length) hidden states... ...made of equivalence classes of signal histories... ...along with transition probabilities. signal A H H a a a h H H a a a A H H... H|1 H|0.5 A;h H h|0.17 a|0.5 A|0.17 a a|0.66
Rationale Methodology Dataset Results Data Hand-made selection Sample of 33 very active political blogs, 6 press sources. Daily collection of posts during November 2006: presidential primary for the French Parti Socialiste (center-left). Selection of 75 (lemmatized) terms — this set makes our “topics”.
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