Do your twenty work as a set, or do you by chance have a favourite ten?
The factors work as a set; they have been selected based on a factor analysis of over 400 statements, to capture things which influence as much of one’s worldview as possible. But this makes the item lists for each factor essentially arbitrary, such that they can be easily substituted or expanded or shortened, without changing the core idea much.
I guess if you want to shorten it by 2x, you could remove the 2nd and the 4th item for factor 0, 1, and 2; and remove the 3rd and the 4th item for factor 2, and remove the 2nd and the 3rd item for factor 4. I wouldn’t recommend this though as the items are usually only 0.4-0.6 correlated with the factors, so to obtain more accurate measurement of the worldview, more items would help. (With 4 items that each have a correlation of 0.5 with the underlying factor, the scales’ correlation with the factor would be 0.76; meanwhile with only 2 items, it would be 0.63.)
The factors work as a set; they have been selected based on a factor analysis of over 400 statements, to capture things which influence as much of one’s worldview as possible. But this makes the item lists for each factor essentially arbitrary, such that they can be easily substituted or expanded or shortened, without changing the core idea much.
I guess if you want to shorten it by 2x, you could remove the 2nd and the 4th item for factor 0, 1, and 2; and remove the 3rd and the 4th item for factor 2, and remove the 2nd and the 3rd item for factor 4. I wouldn’t recommend this though as the items are usually only 0.4-0.6 correlated with the factors, so to obtain more accurate measurement of the worldview, more items would help. (With 4 items that each have a correlation of 0.5 with the underlying factor, the scales’ correlation with the factor would be 0.76; meanwhile with only 2 items, it would be 0.63.)