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One thing that I have always been intrigued by is the debate over the use of scales. One major debate is over the use of a mid-point (e.g. 5 or 7 point vs. 6 point)
When is the appropriate time to use these different scale sizes? What impact will it have on the data?
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The 5 point scale is the happy medium between capturing the information you want and not over loading the survey taker will too many response options. I use a 5 point scale and include a natural indifference point (Neutral response). I try not to force the survey taker to choose between a negative and positive experience. If they are neutral I always give them the option to select it and just hope that they will provide additional information in the comments section. I usually provide comments so that the survey taker can elaborate on the responses provided.
Replied by CoA on 06-29-2010 01:46 PMComment -
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To quote Six Sigma, “5 options is always best." Of course, this is in the context of a specific use-case, but they went on to explain that you should always use an odd number of answer options, to give respondents a "neutral" answer choice if they are on the fence.
WorldAPP's former COO, Alan Farias, also commented against a 1-10 scale for a similar reason. Respondents consider "5" a mid-point on a 1-10 scale, when it is actually slightly below midline. If you prefer that your scale goes to 10, he recommended starting with 0. -
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I was talking about this with our Professional service manager just this morning, and she explained that the 10 point scale provides more variability for better statistical analysis (more accurate results). Although a 5 point scale is often easier for respondents to understand and complete.
Replied by Viki on 07-02-2010 09:41 AM -
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I get the statistical argument with a 10-point, but I believe there are too many options for the survey taker. Also, you have to remember that "5" isn't a neutral center point. That may force the user to make some pretty arbitrary decisions.
The better question, is if you believe the user will be starting from a neutral center point - (3, 4) or 0. Mid point scales are used to measure indifference. Think about it, it isn't assumed that a ice skater gets a mid-point score just for showing up.
Personally, I like a 7 pointer, I have a mid point, max/min and two options in between. Also think about how you will report the data. I typically look at top two box.
Replied by mkuhl on 07-22-2010 05:20 PM -
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