Please comment the Method used in the Construction and Validation of the Scale with six subscales..
1. The development of the SCALE was anchored on a theory with six constructs (A, B, C, D, E and F). The constructs served as subscales.
2. An intensive review of the literature on the topic was done. From the reviewed literature, a total of 222 Items were written for the subscales: 33 for A, 22 for B, 56 for C, 25 D, 46 for E and 40 for F. A 5-point Likert scale response format was then used for all the items (1= never to 5 = always). After some intensive review of the items by two experts of the topic, the number of items narrowed to 190 ( 27 for A, 19 for B, 47 for C, 21 for D, 38 E and 34 for F).
3. The 190-item scale was then subjected to pilot testing to about 2000 respondents. Then, using the gathered data, the item-total correlation for each subscale was analyzed. Of the 190 items, 180 items were retained because the ten items with below .30 item-total correlation were removed.
4. The 180 items were then subjected to factor analysis using the principal component analysis and varimax rotation procedure. A six factor solution was prespecified such that the number of factors should correspond to the number of subscales. Results of the factor analysis showed that the 180 items scattered in the six factors with factor loadings ranging between 0.303 and 0.776: In
particular, forty-seven (47) items significantly loaded in Factor 1; sixty-five (56) in Factor 2; fifty-five (55) in Factor 3; seven (7) in Factor 4, and five (5) in Factor 5. Factor 6 was dropped because only one item was loaded and its factor loading is low. The factors were then defined according to the theoretical contructs. That is, Factor 1 (with 47 items) was called A; Factor 2 (with 65 items) was called B, Factor 3 (with 55 items) was called C and D (C and D was combined), Factor 4 (with 5 items) was called E; and Factor 5 (with 7) was called F.
5. Each resulting factor in Step 4 above was then subjected to factor analysis to uncover subfactors for each factor. Each of Factors 1 and 2 consisted of 7 subfactors; Factor 3 has 5 subfactors; Factor 4 has 2 subfactors; and Factor 5 has no subfactor. Each subfactor was defined based on the theme that corresponds with the loaded items.
6. The Cronbach alpha was computed for each subfactor and factor as well as scale. The alpha coeffciients are >.80.
7. Thus, the Final SCALE consited of 179 items: 47 items for subscale A, 65 for subscale B, 55 for the combined subscales C and D, 7 for for subscale E and 5 for subscale F. Each subscale has sub-subcales.
Please critic on the method used.
Thank you.
Eins
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