Do Cancer Cluster Really Exist?. Definitions Are Important. Robert N. Hoover, M.D National Cancer Institute defines a cancer cluster as “the occurrence of a greater than expected number of cases of a particular disease within a group of people, a geographic area, or a period of time.".
Schools Near Toxic Waste Sites are Making Children Sick
By Michele Norris
An Elmira mother and her son will appear at 9 a.m. today on MSNBC\'s "The Hour Show" to discuss the state\'s cancer investigation at Southside High School.
The Patros family has also been contacted by ABC\'s "Good Morning America" to discuss their views about the investigation, said husband and father, Andy Patros, who remained in Elmira.
SOUTHSIDE HIGH SCHOOLDraft for Public CommentU.S. Department of Health & Human Services Public Health ServiceAgency for Toxic Substances and Disease Registry
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Most people understand that the confetti will fall in clumps with bare spaces between the clumps. Why should randomly distributed cancer cases look any different?
To illustrate, try this Excel exercise to generate and examine random distribution over space. Use Tools/Data Analysis/Random Number Generator to generate a Uniform distribution of 2 sets of 400 random numbers between 0 and 100
Make an xy scatter diagram using one variable as the x axis and the other as the y axes. You now have 400 randomly distributed dots over a 100 by 100 graphical space. Below is one result
We can add grid lines to the diagram to create large and small geographic areas. How will deviation from the expected value be affected by the size of the geographic area?
As the geographic areas get smaller the number of areas that deviate significantly from the expected increases and the magnitude of the deviation increases.