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Asking Questions - The Definitive Guide To Questionnaire Design ...

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ASKING AND RECORDING QUESTIONS 163<br />

“Using <strong>Questions</strong> That Include a Middle Point.” <strong>The</strong>re is no right<br />

or wrong number of categories. It depends entirely on the research<br />

topic being investigated and how important it is to you to have<br />

some indication of the direction in which people in the middle are<br />

leaning. With a very large number of points on the scale, the question<br />

is probably moot, since respondents would be responding<br />

more to the approximate position than they would be to the actual<br />

numbers.<br />

Few or Many?<br />

Another issue is how many categories should be offered and on<br />

what scale (5 points, 7 points, 9 points?). Some think that offering<br />

a scale with a larger number of points will help increase the variance<br />

in responses and better help distinguish extreme opinions.<br />

Although a number of theoretical considerations exist, how to<br />

number categories is generally determined by weighing how much<br />

space one wants to use against what can provide the greatest differentiation.<br />

If the intervals are spaced out to maximize variation<br />

(through the use of pilot tests), fewer boxes will be needed. If precision<br />

is a concern, use fill-in-the-blank questions.<br />

A method that obtains readings by use of a 100-point scale is<br />

shown in Figure 5.1. Here the scale is analogous to a thermometer,<br />

containing many numbers with which respondents will be familiar.<br />

Another common image used in rating scales is that of a ladder.<br />

<strong>The</strong> image, introduced by Cantril (1965), seems particularly well<br />

adapted to ratings that involve vertical or hierarchical dimensions,<br />

such as occupational prestige ratings or questions about the degree<br />

to which one has fulfilled one’s aspirations. Other graphic images,<br />

limited only by the imagination of the investigator and the necessity<br />

that respondents understand them, might be used for these<br />

types of scales. <strong>The</strong> difficulty with these scales is they often become<br />

idiosyncratic to the topic, and care must be taken to ensure that<br />

they will be accepted by the parties to whom the research will be<br />

presented (policymakers, sponsors, editors, or reviewers).

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