When Design meets Math

  1. Fits Law

MT=a+b log2(2 D/W)

P(A|B)=( P(B|A).P(A) ) / P(B)

  • Explicitly state your assumptions.
  • Keep your assumptions separate from what reality is telling you — and update them accordingly.
  • Interval variable: equal intervals on the variable (e.g. on the scale of 1 to 5 ratings, the difference between 1 and 3 is equivalent to the difference between 3 and 5)
  • Ratio variable: the same as the interval variable, but in terms of ratio (e.g. a reaction time of 4 seconds is twice as long as a reaction time of 2 seconds and a half as long as a reaction time of 8 seconds).

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