The Source Data table details the number of articles published in the current year by the journal, the total number of references contained in those articles, and the average number of references per article. The article counts given for journals include only original research and review articles. Editorials, letters, news items, and meeting abstracts are not counted, because they are not generally cited (see Using the JCR Wisely). Cited-only journals that appear in the JCR have no Source Data. The Source Data Listing not only shows the ratio of cited references to all articles published by the journal (in the "Combined" column), it also gives you the average number of references in each "nonreview" (original research) and review article. This permits you to see which journals published reviews and how many they published. Review articles are often more highly cited than original research articles. Articles are coded as "reviews" if they have more than 100 references, if they appear in review publications or review sections of journals, if they have the word Review or Overview in their titles, or if the summary states that the article is a review or a survey.
All information contained in original records and certified copies of results, observations or other facets required for the reconstruction and evaluation of the study that is contained in source documents.
All information in original records and certified copies of original records of clinical findings, observations, or other activities in a clinical trial necessary for the reconstruction and evaluation of the trial. Source data are contained in source documents (original records or certified copies). (ICH)
Source data is the origin of information found in electronic media. Often when data is captured in one electronic system and then transferred to another, there is a loss of audit trail or the inherent data cannot be absolutely verified. There are systems that provide for absolute data export but then the system imported into has to allow for all available data fields to be imported.