InfluentialPoints.com
Biology, images, analysis, design...
Use/Abuse Principles How To Related
"It has long been an axiom of mine that the little things are infinitely the most important" (Sherlock Holmes)

Search this site

 

 

Just a note

X2   =  Σ  (fi - i)2
i
Where:
  • X2 is Pearson's chi squared statistic,
  • fi is observed frequency in cells a to d,
  • i is its expected frequency in cells a to d calculated from the marginal totals.
    For example, a = ((a + b)/N )(a + c)