Some useful transformations
| Types of data | Transformations |
|---|---|
| Positive skew, increasing variance | Logarithmic = ln x, log10 x |
| Negative skew, decreasing variance | Square power = x2 |
| Count; Poisson distribution | Square root = √x |
| Time; survival data | Inverse = 1/x |
| Proportion; p, binomial distribution | Logit = ln (p/1−p); Arcsin = Arcsin√p; Probit = cumulative normal deviate |