Table 5.
Correlations between all variables according to skill level.
| Expert | |||||||
| Ball speed | BVE | MVM | FED | FEV | DFAD | DFAV | |
| MRE (m) | 0.216 | −0.166 | −0.205 | −0.220 | 0.026 | 0.104 | 0.222 |
| Ball speed (km/h) | -- | −0.350** | −0.214 | 0.008 | −0.097 | −0.102 | −0.076 |
| BVE (m) | -- | -- | 0.595** | −0.125 | −0.232 | 0.268* | 0.164 |
| MVM (m/s) | -- | -- | -- | 0.629** | 0.190 | −0.176 | 0.259* |
| FED | -- | -- | -- | -- | 0.480** | −0.496** | 0.176 |
| FEV | -- | -- | -- | -- | -- | −0.093 | −0.286* |
| DFAD | -- | -- | -- | -- | -- | -- | −0.074 |
| Recreational | |||||||
| Ball speed | BVE | MVM | FED | FEV | DFAD | DFAV | |
| MRE (m) | 0.008 | 0.225 | −0.165 | −0.252 | −0.051 | 0.140 | −0.071 |
| Ball speed (km/h) | -- | 0.067 | 0.132 | 0.230 | 0.351** | −0.237 | −0.328* |
| BVE (m) | -- | -- | 0.290* | −0.121 | −0.217 | 0.081 | −0.089 |
| MVM (m/s) | -- | -- | -- | 0.793** | 0.332* | −0.514** | −0.255 |
| FED | -- | -- | -- | -- | 0.640** | −0.724** | −0.282* |
| FEV | -- | -- | -- | -- | -- | −0.561** | −0.151 |
| DFAD | -- | -- | -- | -- | -- | -- | 0.410** |
| * p < .05; ** p < .01 | |||||||
MRE: mean radial error (m); ball speed (km/h); BVE: bivariate variable error (m); MVM: mean celocity magnitude (m/s); FED: fuzzy entropy of the displacement of COP (unitless); FEV: fuzzy entropy of the velocity of COP (unitless); DFAD: detrended fluctuation analysis of the displacement of COP (unitless); DFAV: detrended fluctuation analysis of the velocity of COP (unitless).