In a recent paper in the Journal of the American Society for Information Science and Technology, Leydesdorff and Vaughan assert that raw cocitation data should be analyzed directly, without first applying a normalization like the Pearson correlation. In this report, it is argued that there is...

In a recent article in JASIST, L. Leydesdorff and L. Vaughan (2006) asserted that raw cocitation data should be analyzed directly, without first applying a normalization such as the Pearson correlation. In this communication, it is argued that there is nothing wrong with the widely adopted...

We introduce two new measures of the performance of a scientist. One measure, referred to as the halpha;-index, generalizes the well-known h-index or Hirsch index. The other measure, referred to as the galpha;-index, generalizes the closely related g-index. We analyze theoretically the...