Profit (p)-Index calculator
Estimate the degree to which authors profit from co-authors
Most measures of the productivity and academic impact of a given scientist are based on the number of publications and number of citations, ignoring the often substantial contributions of others to the academic performance of such scientist. The profit index (or p-index) estimates the contribution of co-authors to the work of a given author. Therefore, it can be seen as a measure of a scientist's autonomous academic performance and/or originality (the lower the p-index, the better).
Note: The p-index assumes that the first and last authors are the most important contributors to a particular work. This is considered so in many research disciplines such as Computer Science or biomedical sciences. However, it doesn't apply to research disciplines with alternative conventions of authorship placement; e.g. in Mathematics or Physics authors are often listed in alphabetical order.