ECOS Psychometric Properties
Full details of the development of the ECOS can be found in Rose, Markland and Parfitt (2001). Following initial consensus validation work on the scenarios and responses, and a pilot study, a preliminary version of the ECOS comprising nine scenarios was completed by 592 adult respondents. The factorial validity of the scale was assessed using a multi-trait, multi-method approach. Specifically, a correlated-trait, correlated uniquenesses model was assessed using confirmatory factor analysis in LISREL 8.30.
ECOS conceptual model
Starting with a nine scenario model, scenarios were successively removed based on evidence of factorial ambiguity among the items to achieve the best-fitting model whilst maintaining optimum breadth of content. A seven-scenario model was eventually accepted. The fit of this model was: Satorra-Bentler scaled chi sq = 387; minimum fit function chi square = 445; df = 165; CFI = .96; SRMR = .06; RMSEA = .05 (90% confidence interval. = .04 : 06).
The intercorrelations among the orientations were as follows:
Autonomy |
Control |
Impersonal |
|
| Autonomy | 1.00 |
||
| Control | .01 |
1.00 |
|
| Impersonal | -.53 |
.55 |
1.00 |