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The long-running annual report, called the Monitoring the Future survey and financed by the National Institutes of Health, looked at more than 46,000 students nationwide.
The separate report, on teenage drug, alcohol and tobacco use, was the annual Monitoring the Future survey of 8th, 10th and 12th graders, issued by the Department of Health and Human Services.
Among seniors today, according to the University of Michigan's Monitoring the Future survey, which has tracked teenage risk behaviors since 1975, 45.5 percent have tried the drug and 6.6 percent are smoking it frequently.
A recent Monitoring the Future survey by the National Institute on Drug Abuse reported a slight dip to 5.5 percent in usage from 2009 to this year among high school seniors.
While cocaine use has fallen among younger teenagers, 12th graders are using more: 5.2percentt used cocaine last year — up from 4.8percentt in 2001 and 3.1percentt at the low point in 1992, says a Monitoring the Future survey done by the University of Michigan.
The 2015 Monitoring the Future Survey, conducted by the University of Michigan and the National Institute on Drug Abuse NIDAA) since 1975, found that past-year use of alcohol and illicit drugs other than marijuana continued their two-decade-long decline among America's 8th-, 10th- and 12th-graders.
Spatial and temporal variations should be considered in a future survey.
Several poorly sampled regions are identified that may represent rewarding future survey targets.
Section 6 discusses the implications of a Fisher Information criterion for Likert scale interpretation, and draws conclusions germane to future survey design.
