Assortativiteit en wederkerigheid

Nog twee belangrijke onderdelen om onze grafen te begrijpen zijn wederkerigheid en graadassortativiteit. Herinner je dat wederkerigheid het aantal knopen is met verbindingen in beide richtingen. In de retweet-graaf meet wederkerigheid dus hoeveel knopen elkaar retweeten. In de mention-graaf laat het zien hoeveel knopen een gesprek over en weer voeren.

Assortativiteit is wat minder vanzelfsprekend. Waarden groter dan 0 geven aan dat knopen met een hoge graad de neiging hebben met elkaar verbonden te zijn. Waarden kleiner dan nul wijzen echter op een meer graad-disassortatieve graaf. Zie je bij het visualiseren een ‘hub-en-spaak’-patroon, dan is de graaf waarschijnlijk disassortatief.

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Casestudies: netwerkanalyse in R

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Praktische interactieve oefening

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# Find the reciprocity of the retweet graph
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# Find the reciprocity of the mention graph
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Deze oefening maakt deel uit van de cursus

Casestudies: netwerkanalyse in R

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In this chapter you'll explore a subset of an Amazon purchase graph. You'll build on what you've already learned, finding important products and discovering what drives purchases. You'll also examine how graphs can change through time by looking at the graph during different time periods.

Exercise 1: Exploring your data set Exercise 2: Finding Dyads and Triads Exercise 3: Clustering and Reciprocity Exercise 4: Important Products Exercise 5: What Makes an Important Product?Exercise 6: Exploring temporal structure Exercise 7: Metrics through time Exercise 8: Plotting Metrics Over Time

In this lesson you'll explore some Twitter data about R by looking at conversations using '#rstats'. First you'll look at the raw data and think about how you want to build your graph. There's a number of ways to do this, and we'll cover two ways: retweets and mentions. You'll build those graphs and then compare them on a number of metrics.

Exercise 1: Je retweet-grafiek maken Exercise 2: Visualiseer de graaf Exercise 3: Visualiseer knopen op basis van graad Exercise 4: Wat is de verdeling van centraliteit?Exercise 5: Wie is belangrijk in het gesprek?Exercise 6: Belangrijke knopen plotten Exercise 7: Een mentions-grafiek maken Exercise 8: Vermeldings- vs. retweetgrafiek vergelijken Exercise 9: Assortativiteit en wederkerigheid

Huidige oefening

Exercise 10: Uitvinden wie met wie praat Exercise 11: Gemeenschappen vinden Exercise 12: Community-algoritmes vergelijken Exercise 13: Gemeenschappen visualiseren

In this chapter you will analyze data from a Chicago bike sharing network. We will build on the concepts already covered in the introductory course, and add a few new ones to handle graphs with weighted edges. You will also start with data in a slightly more raw form and cover how to build your graph up from a data source you might find.

Exercise 1: Creating our graph from raw data Exercise 2: Making Graphs of Different User Types Exercise 3: Compare Graphs of Different User Types Exercise 4: Compare graph distance vs. geographic distance Exercise 5: Compare Subscriber vs. Non-Subscriber Distances Exercise 6: Most Traveled To and From Stations Exercise 7: Most Traveled To and From Stations with Weights Exercise 8: Visualize central vertices Exercise 9: Weighted Measures of Centrality Exercise 10: Connectivity Exercise 11: Find the minimum cut 1 Exercise 12: Find the minimum cut 2 Exercise 13: Unweighted Clustering Randomizations Exercise 14: Weighted Clustering Randomizations

So far everything we've done has been using plotting from igraph. It provides many powerful ways to plot your graph data. However many people prefer interacting with other plotting frameworks like ggplot2, or even interactive frameworks like d3.js. In this lesson you'll look at other plotting libraries that build on the ggplot2 framework. You'll also look at other non-"hairball" type methods like hive plots, as well as building interactive and animated plots.

Exercise 1: Other packages for plotting graphs!Exercise 2: ggnet Basics Exercise 3: ggnetwork Basics Exercise 4: More ggnet Plotting Options Exercise 5: More ggnetwork Plotting Options Exercise 6: Interactive visualizations Exercise 7: Interactive plots with ggiraph Exercise 8: Interactive javascript plots Exercise 9: Alternative visualizations Exercise 10: Alternative ways to visualize a graph: Hive plots Exercise 11: BioFabric as an HTML widget Exercise 12: Plotting graphs on a map