4.3. Comparison of competition and collaboration levels among mobile ecosystems
Using the data in these networks, we next calculated actor degree centrality for weighted networks as formulated in Eq.
(1). The calculated weighted degree centralities are listed in Table 3. Since platforms had some before–now and now–after
assessments, there are corresponding rows in the table to indicate the effect that it had on degree centrality. In addition to
showing the data calculated from experts’ assessment, Table 3 lists degree centralities calculated by taking into account our
validated re-assessments and also how much they differed from each other. As can be seen from the last two columns in the
table, the difference between aggregated values is very small except for Nokia. Since the difference is so small, we decided to
rely on experts’ data in all our analyses. The only exception is the addition of updated data for Microsoft Windows Phone
(Surface tablet case) that was not covered by the survey.