T.test

From Wikipedia

Revision as of 18:11, 7 August 2006; view current revision
←Older revision | Newer revision→
Jump to: navigation, search
#example
  t.test(1:10,y=c(7:20))      # P = .00001855
  t.test(1:10,y=c(7:20, 200)) # P = .1245    -- NOT significant anymore
# Classical example: Student's sleep data
  plot(extra ~ group, data = sleep)
# Traditional interface
  with(sleep, t.test(extra[group == 1], extra[group == 2]))
# Formula interface
  t.test(extra ~ group, data = sleep)
Retrieved from "http://www.rar.duhs.duke.edu/wiki/index.php/T.test"