Statistics › Section M · The F distribution and ANOVA › Topic M.2

Facts about the F distribution

ANOVA's verdicts are read from the F distribution - a family of right-leaning curves built from ratios of variances. Meet the family before the two-variance test puts it to final use: two degrees of freedom, values near 1 when nothing is happening, and a long right tail when something is.

In this topic

  • A distribution of ratios
  • Two parameters, always
  • Shape: leaning right from zero
  • The mean
  • Worked example: reading F against its centre
  • Where F appears
  • Worked example: one statistic, three curves
  • Common mistakes to avoid
  • Key takeaways

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