Multi-query center: Longitudinal data
Note: This tutorial was originally written for Publish or Perish version 4 and all screenshots come from this version. Publish or Perish version 5 shows the multi-query center at the top of every screen for easier access. Its basic functions are similar to PoP4, however.
The Publish or Perish Multi-query center is also very useful if you want to run the same query periodically to compare metrics over time.
Copy queries before re-running them
In order to ensure you keep the results of older queries intact, you need to copy the query and run the copied query again. If you run the original query again, the old results will be replaced by the new data.
Worked example: longitudinal author search
I have a folder in which I keep monthly queries for my own name since May 2013. Longitudinal results for individuals might be important to establish progress for a tenure, promotion, or grant application.
Longitudinal searches for growth of research area
However, longitudinal searches can also serve many other purposes, such as the growth of publications in a particular research area or the development of impact of particular journals over time.
Longitudinal data illustrate differences in research metrics
Longitudinal data also allow us to illustrate the features of different research metrics. In the author example above, you can clearly see how the number of citations increases quite rapidly. In contrast, the h-index, the g-index and the hI,norm increase at a slow but steady rate. The number of citations per year also increases, but takes a small dip every January when the year is increased by 1.
hI,annual metrics tends to be fairly stable over time
In contrast, the hI,annual is quite stable over time, dipping every January when the year is increased by 1, gradually rising again over the year as the hI,norm increases and then dipping again in January. This show clearly that it is very hard to substantially increase the hI,annual and that even maintaining it needs a steady increase in the hI,norm to counteract the natural decline over the years.
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Copyright © 2017 Anne-Wil Harzing. All rights reserved. Page last modified on Sun 12 Mar 2017 14:58
Anne-Wil Harzing is Professor of International Management at Middlesex University, London. In addition to her academic duties, she also maintains the Journal Quality List and is the driving force behind the popular Publish or Perish software program.