Can we crowd-fund a meta-analysis? Simply find studies that report summary statistics, and add them to the dataset.
The data so far:
| Study | N | r |
| Willoughby (1927, 1928), A | 90 | 0.44 |
| Willoughby (1927, 1928), A | 90 | 0.44 |
| Jones (1928), A | 105 | 0.60 |
| Burks (1928), A | 274 | 0.47 |
| Colom et al 2002 | 342 | 0.492 |
| Terman and Oden (1959), B | unknown | 0.481 |
| Total N | Weighted mean | |
| 901 | 0.488 | |
| Median | ||
| 0.475 |
