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Formula

Algebraically speaking -

SEp1-p2  =    1  
f + g -  (f - g)2
n n
Where:
  • SEp1-p2 is the standard error of the difference between the proportions p1 - p2 or a/n - c/n or f/n - g/n,
  • f is the number of individuals changing from present to absent,
  • g is the number of individuals changing from absent to present,
  • n is e+f+g+h, the total number of individuals, or the number of paired observations.