Similarities in the Age-Specific Incidence of Colon and Testicular Cancers
Two fitted Weibull distributions are shown. The first assumes that 100% of the population will eventually develop colon carcinoma, while the second makes no assumption about the fraction of the population that will develop colon carcinoma, but instead fits it as a parameter. The best fit parameter is about 12% of the population, while the line representing 100% of the population is a good fit, but not perfect. More data in the 85–99 range will clearly delineate between the two cases.