By jdelmonico - 2/7/2016
Hello! I am using a scale which is typically rated from 0 to 100, so rather than use radiobuttons and have a big ugly question I decided to go with a scale. Unfortunately, a couple of those questions are supposed to be reverse-scored. Is there any way to reverse-score a slider item? Or should I just forego the creation of summary scores until after the data are in? Thank you!
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By jdelmonico - 2/7/2016
And by "scale" I mean slider! If that wasn't clear.
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By Dave - 2/7/2016
If you have a slider ranging from 0 to 100, you should be able to reverse-score it mathematically by calculating 100 minus the slider-response.
<values>
/ score = 0
</values>
<block myblock>
/ trials = [1=mypage]
</block>
<surveypage mypage>
/ ontrialend = [values.score = slider.a.response + (100-slider.b.response)]
/ questions = [1=a; 2=b]
</surveypage>
<slider a>
/ caption = "Scoring: Normal"
/ range = (0,100)
</slider>
<slider b>
/ caption = "Scoring: Reversed"
/ range = (0,100)
</slider>
<data>
/ columns = [date time subject trialnum trialcode slider.a.response slider.b.response values.score]
/ separatefiles = true
</data>
Slider 'b' in the above would be the one that's reverse-scored.
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By jdelmonico - 2/7/2016
Thank you very much!
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