FACTOR ANALYSES OF THE McGILL PAIN QUESTIONNAIRE (MPQ) IN ACUTE AND CHRONIC PAIN PATIENTS.The McGill Pain Questionnaire (MPQ) aims to measure sensory, affective, and evaluative dimensions of pain. 
the McGill Pain Questionnaire (MPQ)
Exploratory (EFA) factor analyses were used to investigate the structure of the MPQ based on the responses of a diverse sample of 448 pain patients (M age = 43.1 yr., SD = 19.3).  The EFA employed a methodologically sound iterative maximum-likelihood procedure, together with direct oblimin oblique simple structure rotation. 
EFA
The EFA employed a methodologically sound iterative maximum-likelihood procedure, together with direct oblimin oblique simple structure rotation. 
maximum-likelihood procedure
The EFA employed a methodologically sound iterative maximum-likelihood procedure, together with direct oblimin oblique simple structure rotation. 
oblimin oblique simple structure rotation