  Presents the result of the calculated IS! equivalent Impact Factor, Relative
Diffusion Factor (RDF), and Journal Diffusion Factor (JDF) for articles
published in the Medical Journal of Malaysia (MJM) between the years 2004 and
2008 in both their synchronous and diachronous versions. The publication data
are collected from MyAis (Malaysian Abstracting & Indexing system) while the
citation data are collected from Google Scholar. The values of the synchronous
JDF ranges from 0.057 - 0.14 while the diachronous JDF ranges from 0.46 - 1.98.
The high diachronous JDF is explained by a relatively high number of different
citing journals against the number of publications. This implies that the
results of diachronous JDF is influenced by the numbers of publications and a
good comparison may be one of which the subject of analysis have similar number
of publications and citations period. The yearly values of the synchronous RDF
vary in the range of 0.66 - 1.00 while diachronous RDF ranges from 0.62 - 0.88.
The result shows that diachronous RDF is negatively correlated with the number
of citations, resulting in a low RDF value for highly cited publication years.
What this implies in practice is that the diffusion factors can be calculated
for every additional year at any journal level of analysis. This study
demonstrates that these indicators are valuable tools that help to show
development of journals as it changes through time.
