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Z-score for common scale

  1. Oct 5, 2009 #1

    I would like to know something about the possibilty to convert data set into z-scores to ensure a common scale for analysis. More specifically, when this conversion is needed and why. I am working on motion data (from 3 persons) tracked from video and I can use a common reference for the whole data set or a reference for each single person. I found the z-score conversion in a paper, but I cannot understand when it is really needed.

    thank you

  2. jcsd
  3. Oct 5, 2009 #2


    Staff: Mentor

    The basic assumption in using z-scores is that the attribute you're measuring is normally distributed. The z-score allows you to transform values that have a mean of mu and a standard deviation of sigma to new values with mean 0 and standard deviation 1. The reason for doing this is that there are widely published tables with probabilities for z-scores, while such tables for the raw x-scores can be found rarely, if at all.

    Hope that helps.
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