| Level | Item |
| Ref No | BPS/004/1/06/01/150 |
| Title | Note on Different Types of Correlation Coefficient. |
| Date | 9 November 1942 |
| Extent | 1 item |
| Description | Report titled 'Note on Different Types of Correlation Coefficient.' (no. 48) by Philip E. Vernon.
The report outlines various types of coefficients and their differences. The first one is a rank-order correlation, where both the test and the criterion need to be ranked in increasing order. A product-moment correlation is the most common method, where the scores are approximately normally distributed. Contingency is used when marks are not normally distributed, or when qualitative categories are used. Biserial r is used when one of the variables consists of scores, and the other one consists of only two categories. Biserial r with top and bottom cases can be applied when the scores are available only for the 'bests' and 'worsts' in a group. Tetrachoric r is used when both variables consist of only two categories. |
| Notes | The History of Psychology Centre is committed to creating an inclusive environment for all our users. Be aware that our catalogue contains historic terminology relating to mental health which could be considered offensive. The terminology exists within the original record and has been retained to inform users on viewpoints at the time. It in no way reflects the attitudes of the cataloguers or the British Psychological Society. |
| AccessConditions | Registered Users by Appointment Only. |
| AccessStatus | Open |
| Location | O16 |
| Copyright | Subject to the condition of the original, copies may be supplied for private research use only on receipt of a signed undertaking to comply with current copyright legislation. Permission to make any published use of material from the collection must be sought in advance from the Head of the History of Psychology Centre and Archives and, where appropriate, from the copyright owner. Where possible, assistance will be given in identifying copyright owners, but responsibility for ensuring copyright clearance rests with the user of the material |
| Rules | Description compiled in line with the following: ISAD (G) General International Standard Archival Description MAD3 Third Edition 2000 |
| ArchNote | Compiled by Sophie O’Reilly BPS Archivist History of Psychology Centre. |