Thurstone Differential

1 The restaurant has a friendly atmosphere 15 The restaurant offers a good choice of menus 21 Always rely on the quality of the food Average

1 The restaurant has a friendly atmosphere 15 The restaurant offers a good choice of menus 21 Always rely on the quality of the food Average

An unbalanced set of categories might be preferred, however, when there is prior evidence that, in general, attitudes held are at extreme positions. For example, if all viewpoints are likely to be positive, then more precision may be obtained by offering the categories:

1 outstanding

2 well above average

3 above average

4 average

5 below average.

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