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Introduzione all'analisi delle reti sociali #datajournalism

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Introduzione ai concetti dell'analisi di reti sociali in modo da fornire le basi con con un giornalista può affrontare l'argomento.
Teoria, esempi, strumenti online per la raccolta dati dai social media e breve tutorial all'uso di gephi.
Corso svolto per l'ordine dei giornalisti del Trentino Alto Adige

Veröffentlicht in: Daten & Analysen
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Introduzione all'analisi delle reti sociali #datajournalism

  1. 1. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Introduzione alla social network analysis Maurizio Napolitano <napo@fbk.eu> #DATAJOURNALISM
  2. 2. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Obiettivo della lezione capire una analisi di rete sociale raccogliere ed elaborare dati per la sna Es. scambio di messaggi su twitter
  3. 3. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Agenda - datajournalism e social network analysis - metriche di base - esempi di sna - strumenti per analizzare flussi da social media - mini tutorial a gephi
  4. 4. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Data journalism http://datajournalismhandbook.org/
  5. 5. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo
  6. 6. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo
  7. 7. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Risultato di una analisi di rete sociale Jacob Levi Moreno (1889-1974) sociometria sorgente immagine: Grandjean, Martin (2014). "La conoscenza è una rete". The Cahiers du Numérique 10 (3): 37-54. DOI: 10,3166 / LCN.10.3.37-54.
  8. 8. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo una questione in sospeso - episodio 16 - seconda stagione Il problema da risolvere https://drive.google.com/open?id=1Q6fC8Gm4nmnjCAGhrz4Uab1Mg9vzuRKU
  9. 9. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo una questione in sospeso - episodio 16 - seconda stagione La scoperta con la SNA https://drive.google.com/open?id=1Q6fC8Gm4nmnjCAGhrz4Uab1Mg9vzuRKU
  10. 10. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo ABC della Social Network Analysis (e teoria dei grafi)
  11. 11. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo NODI
  12. 12. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo RELAZIONI (edge)
  13. 13. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo RETE INDIRETTA (non ci sono direzioni sulle relazioni)
  14. 14. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo RETE DIRETTA (ci sono direzioni sulle relazioni)
  15. 15. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo DEGREE numero di relazioni che attraversano un nodo GRADO DI ATTIVITÀ DI UN NODO DEGREE 4 DEGREE 3 DEGREE 3
  16. 16. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo IN DEGREE numero di relazioni in entrata in un nodo POPOLARITÀ RECETTIVITÀ IN DEGREE 2 IN DEGREE 2 IN DEGREE 1
  17. 17. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo OUT DEGREE numero di relazioni in uscita da un nodo ESPANSIVITÀ OUT DEGREE 2 OUT DEGREE 1 OUT DEGREE 2
  18. 18. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo BETWEENNESS numero interazioni possibili fra due nodi non adiacenti CONTROLLO NELLA COMUNICAZIONE BETWEENNESS 0,5 BETWEENNESS 0 BETWEENNESS 0
  19. 19. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo CLOSENESS distanza media di un nodo da tutti gli altri CAPACITÀ DI DIALOGARE CON GLI ALTRI CLOSENESS 1 CLOSENESS 0.6 CLOSENESS 1
  20. 20. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo ECCENTRICITY la lontananza di un nodo dal centro della rete LIVELLO DI DIFFICOLTÀ NELL'ESSERE RAGGIUNTO ECCENTRICITY 1 ECCENTRICITY 2 ECCENTRICITY 1
  21. 21. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo EIGENVECTORS importanza di un nodo sulla rete basata sulle connesisoni ai nodi INFLUENZA DI UN NODO SU UNA RETE EIGENVECTORS 0.5 EIGENVECTORS 0 EIGENVECTORS 0
  22. 22. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo MODULARITY algoritmo di identificazione delle comunità di una rete* IDENTIFICAZIONE DI GRUPPI MODULARITY 0 MODULARITY 0 MODULARITY 0 incent D Blondel, Jean-Loup Guillaume, Renaud Lambiotte, Etienne Lefebvre, Fast unfolding of communities in large networks, in Journal of Statistical Mechanics: Theory and Experiment 2008 (10), P1000
  23. 23. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo DENSITÀ la proporzione di relazioni presenti nel grafo sul totale di tutte le possibili INDICATORE DI COESIONE ALTA BASSA
  24. 24. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Il numero di Bacon https://oracleofbacon.org/
  25. 25. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo http://moviegalaxies.com
  26. 26. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Mapping Dante https://www.mappingdante.com/network-graph/
  27. 27. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo http://openpartecipate.agenziacoesione.gov.it/#/index
  28. 28. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo
  29. 29. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo http://socioviz.net SOCIOVIZ
  30. 30. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo https://www.youtube.com/watch?v=9yUhPqLMVVc#action=share
  31. 31. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo https://netlytic.org/
  32. 32. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Strumenti per analizzare i dati
  33. 33. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo https://www.databasic.io/en/connectthedots/
  34. 34. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Mini tutorial a GEPHI http://gephi.org
  35. 35. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Creare una rete
  36. 36. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Creare una rete
  37. 37. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Creare una rete
  38. 38. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Inserire i nodi per: Elisabeth Harry Megahan Nodi
  39. 39. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo E le relazioni 1. aggiungere una relazione (edge) 2. scegliere il tipo di relazione (directed) 3. definire la sorgente (source) .. 4. e la destinazione (target …) (ripetere per tutte le relazioni)
  40. 40. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Vedere tutte le relazioni Esempio: Elisabeth -> Harry Harry -> Elisabeth Harry -> Megahan Megahan -> Harry Megahan -> Elisabeth
  41. 41. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Passare in "overview" nota: il grafico potrebbe esser diverso ma comunqu erichiamerà un triangolo
  42. 42. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Calcolare le dimensioni del grafo (network diameter)
  43. 43. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Calcolare le dimensioni del grafo (network diameter)
  44. 44. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Calcolare le dimensioni del grafo (network diameter)
  45. 45. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Vedere i valori calcolati
  46. 46. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Passare alla visualizzazione
  47. 47. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Passare alla visualizzazione
  48. 48. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Calcolare altri indicatori (premere su run)
  49. 49. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Rappresentare i nodi per colore per dimensione
  50. 50. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Generare il pdf
  51. 51. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Cambiando gli indicatori ... betweeness Harry è il nodo con maggiore controllo di comunicazione fra Elisabeth e Meghan eccentricity Elisabeth è il nodo più difficile da raggiungere closeness Meghan ed Harry hanno maggiori capacità di ascolto con gli altri
  52. 52. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Dowload di un grafo da socioviz Esempio: discussione intorno al hashtag "#Almirante" scaricando la rete dello scambio di messaggi in italiano fra utenti nella giornata del 15 giugno => file "1529312033438.gexf"
  53. 53. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Import in gephi Gephi permette l'import di vari formati di file fra cui quelli con estensione .gefx 1529312033438.gexf
  54. 54. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo L'output dell'import … da qui poi è possibile calcolare tutti gli indicatori e modificare il grafico a proprio piacimento in relazione a cosa si vuole visualizzare
  55. 55. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Filtrare i dati (scopo: alleggerire le informazioni da visualizzare
  56. 56. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Filtrare i dati (scopo: alleggerire le informazioni da visualizzare
  57. 57. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Esempio: filtro su eigenvector centrality
  58. 58. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Gephi e le sue estensioni Si consiglia l'uso di Twitter Streaming Importer Qui il tutorial https://github.com/seinecle/gephi-tutorials/blob/master/src/main/asciidoc/en/plugins/twitter-streaming-importer-en.adoc
  59. 59. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo In conclusione Molto spesso i grafici della social network analysis sono sotto il cofano del lavoro svolto dal giornalista. Un giornalista ha bisogno di conoscerne le potenzialità e il linguaggio in modo da poter condurre un lavoro di squadra
  60. 60. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Gephi http://gephi.org Socioviz http://socioviz.net Netlyctic https://netlytic.org/ Data Basic IO http://databasic.io Open Partecipate http://openpartecipate.agenziacoesione.gov.it/#/index Movie Galaxy http://moviegalaxy.com Bacon number's http://oraclefofbacon.org Mapping Dante https://www.mappingdante.com/network-graph/ Risorse
  61. 61. Introduzione alla social network analysis Trento 14/05/2018 #datajournalism @napo Maurizio Napolitano http://slideshare.net/napo napolitano@fbk.eu @napo Per contatti Ringraziamenti - The Nounproject per le icone - School of Data per tutorial e immagini - Riccardo Tasso per alcuni demo - Alessandro Zonin per i tool di scraping - Michela Ferron e Paolo Massa per SoNet - Manlio Di Domenico / Alessandro Girardi per l'umano aumentato - Nicolas Falacci e Cheryl Heuton per Numb3rs

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