By employing the Pearson correlation, Fisher-and t-tests, the present study analyzes and compares scientometric data including
number of source items, number of citations, impact factor, immediacy index, citing half-life and cited half-life, for essential
journals in physics, chemistry and engineering, from SCI JCR on the Web 2002. The results of the study reveal that for all
the scientometric indicators, except the cited half-life, there is no significant mean difference between physics and chemistry
subjects indicating similar citation behavior among the scientists. There is no significant mean difference in the citing
half-life among the three subjects. Significant mean difference is generally observed for most of the scientometric indicators
between engineering and physics (or chemistry) demonstrating the difference in citation behavior among engineering researchers
and scientists in physics or chemistry.
Significant correlations among number of source items, number of citations, impact factor, and immediacy index and between
cited half-life and citing half-life generally prevail for each of the three subjects. On the contrary, in general, there
is no significant correlation between the cited half-life and other scientometric indicators. The three subjects present the
same strength of the correlations between number of source items and number of citations, between number of citations and
impact factor, and between cited half-life and citing half-life.