This inspired me to look for other extremely high (albeit spurious) correlations with autism. I discovered a correlation of 0.994 between college costs (tuition + fees) and autism rates between the years 1999 and 2007, inclusive.
In the article that I’m certain to get published in Science, my main conclusion will be this: if we want to slash autism rates, we’ll need to drastically reduce college costs by returning educational funding to the levels of previous decades.
Here’s a graph of the cumulative percentages of the two variables that shows clearly their close association.
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1. Office of Special Education Programs, Data Analysis System (DANS), OMB# 1820-0043: “Children with Disabilities Receiving Special Education Under Part B of the Individuals with Disabilities Education Act”
Table 1-11. Number of children and students served under IDEA, Part B, in the U.S. and outlying areas by age group, year, and disability category: Fall 1999 through fall 2008 (Age Group 6-21)
2. National Center for Education Statistics: Digest of Education Statistics 2010 Tables and Figures
Table 345. Average undergraduate tuition and fees and room and board rates charged for full-time students in degree-granting institutions, by type and control of institution: 1964-65 through 2009-10