Thurstone Scaling

1. Thurstone Scaling

2. Thurstone Scaling - Methods • Equal-appearing intervals • Successive intervals • Paired comparison

3. Decide how to manage multiple tasks. 20 Decide how to manage multiple tasks. 20 Decide how to manage multiple tasks. 20 Manage resources effectively. 4 Manage resources effectively. 4 Manage resources effectively. 4 Decide how to manage multiple tasks. 20 Manage resources effectively. 4 Work quickly and effectively under pressure 49 Decide how to manage multiple tasks. 20 Work quickly and effectively under pressure 49 Work quickly and effectively under pressure 49 Decide how to manage multiple tasks. 20 Manage resources effectively. 4 Decide how to manage multiple tasks. 20 Work quickly and effectively under pressure 49 Manage resources effectively. 4 Decide how to manage multiple tasks. 20 Organize the work when directions are not specific. 39 Decide how to manage multiple tasks. 20 Decide how to manage multiple tasks. 20 Manage resources effectively. 4 Organize the work when directions are not specific. 39 Organize the work when directions are not specific. 39 Manage resources effectively. 4 Manage resources effectively. 4 Manage resources effectively. 4 Decide how to manage multiple tasks. 20 Work quickly and effectively under pressure 49 Organize the work when directions are not specific. 39 Work quickly and effectively under pressure 49 Manage resources effectively. 4 Work quickly and effectively under pressure 49 Work quickly and effectively under pressure 49 Work quickly and effectively under pressure 49 Work quickly and effectively under pressure 49 Organize the work when directions are not specific. 39 Organize the work when directions are not specific. 39 Work quickly and effectively under pressure 49 Organize the work when directions are not specific. 39 Organize the work when directions are not specific. 39 Organize the work when directions are not specific. 39 Organize the work when directions are not specific. 39 Organize the work when directions are not specific. 39 Equal-Appearing Intervals Start with a large set of itemsthat you think all reflect the same construct.

4. Organize the work when directions are not specific. 39 Manage resources effectively. 4 Decide how to manage multiple tasks. 20 Work quickly and effectively under pressure 49 Equal-Appearing Intervals Many judges individually sort these into 11 pileswhere: 1 = least favorable to the concept 11 = most favorable to the concept 1 2 3 4 5 6 7 8 9 10 11

5. Equal-Appearing Intervals For each item, plot the distribution of pile numbers.

6. Equal-Appearing Intervals For each item, plot the distribution of pile numbers.

7. Equal-Appearing Intervals For each item, plot the distribution of pile numbers. Get the median.

8. Equal-Appearing Intervals For each item, plot the distribution of pile numbers. and interquartile range. Get the median.

9. Organize the work when directions are not specific. 39 Organize the work when directions are not specific. 39 Organize the work when directions are not specific. 39 Decide how to manage multiple tasks. 20 Decide how to manage multiple tasks. 20 Work quickly and effectively under pressure 49 Work quickly and effectively under pressure 49 Manage resources effectively. 4 Manage resources effectively. 4 Equal-Appearing Intervals Choose those items that are at equal intervals(from 1 to 11) and that have the smallest interquartile range. 1 2 3 4 5 6 7 8 9 10 11

10. The Other Methods • Follow a specific procedure for sorting/comparingitems in terms of the concept of interest. • Use a simple statistical analysis to determine scale valuefor each item. • Select itemsfrom across the scale range.

11. How Does Respondent Use? • Respondent checks agree or disagree for each item. • The respondent’s total score is the average scale valueof all the items agreed to.