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I fully agree to AliceD's thoughts. If you have a large sample, these problems might add a little noise, but won't make much of a difference (certainly not the cases 2, 3, and 5, because the psychological resolution of the scale is unlikely to be as precise as the millimeter measure suggests anyway). In addition: If you want to be sure not to introduce any ...


I am not an expert on these scales, but my 2-cents worth would be the following, which are simple work-arounds to include all the data: Fine as is; Take the middle of the thick line (the 'average'); Take the center of the circle (draw a cross in it, the intersection is the middle); Apparently "0" - no pain; Take the tip as the marker; Apparently "100". As ...

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