Network sampling coverage II: The effect of non-random missing data on network measurement.


Journal Article

Missing data is an important, but often ignored, aspect of a network study. Measurement validity is affected by missing data, but the level of bias can be difficult to gauge. Here, we describe the effect of missing data on network measurement across widely different circumstances. In Part I of this study (Smith and Moody, 2013), we explored the effect of measurement bias due to randomly missing nodes. Here, we drop the assumption that data are missing at random: what happens to estimates of key network statistics when central nodes are more/less likely to be missing? We answer this question using a wide range of empirical networks and network measures. We find that bias is worse when more central nodes are missing. With respect to network measures, Bonacich centrality is highly sensitive to the loss of central nodes, while closeness centrality is not; distance and bicomponent size are more affected than triad summary measures and behavioral homophily is more robust than degree-homophily. With respect to types of networks, larger, directed networks tend to be more robust, but the relation is weak. We end the paper with a practical application, showing how researchers can use our results (translated into a publically available java application) to gauge the bias in their own data.

Full Text

Duke Authors

Cited Authors

  • Smith, JA; Moody, J; Morgan, J

Published Date

  • January 2017

Published In

Volume / Issue

  • 48 /

Start / End Page

  • 78 - 99

PubMed ID

  • 27867254

Pubmed Central ID

  • 27867254

International Standard Serial Number (ISSN)

  • 0378-8733

Digital Object Identifier (DOI)

  • 10.1016/j.socnet.2016.04.005


  • eng