Chapter 9: Analyses Using Disease Ontologies
Figure 3
Tag cloud output: An example for the annotations of grants from FY1981 using SNOMEDCT.
Blue denotes low-frequency terms and red denotes highly frequent terms. Many concepts, such as “neoplasm of digestive tract”, occur at high frequencies in most years, possibly denoting the constant focus on cancer research. An appropriate background term frequency distribution is necessary to determine significance of the high frequency.