  There is a growing need for ranking universities, departments, research
groups, and individual scholars. Usually, the scientific community measures the
scientific merits of the researchers by using a variety of indicators that take
into account both the productivity of scholars and the impact of their
publications. We propose the t-index, the new indicator to measure the
scientific merits of the individual researchers. The proposed t-index takes
into account the number of citations, number of coauthors on every published
paper, and career duration. The t-index makes the possible comparison of
researchers at various stages of their careers. We also use in this paper the
Data Envelopment Analysis (DEA) to measure the scientific merits of the
individual researchers within the observed group of researchers. We chose 15
scholars in the scientific area of transportation engineering and measured
their t-index values, as well as DEA scores.
