Table 3 Smoothing and transformation of surveys showing departure from a normal distribution (n = 533)
| Type of transformation or smoothing technique applied to “non-normal” distributions (n = 533) | N (%) “normal” distributions | |
|---|---|---|
| Smoothing | Spline | 301 (56.5) |
| Loess | 318 (59.7) | |
| Box-Cox transformation | Power transformations | 304 (57.0) |
| Smoothing and Box-Cox transformation | Box-Cox after Spline | 439 (82.4) |
| Box-Cox after Loess | 441 (82.7) | |