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    If I was calculating spearman's ranks could I did it from data that have different variables. for example the force applied to a spring and the extension of the spring? so force would be the x value and extension would be the y value.
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    (Original post by dont)
    If I was calculating spearman's ranks could I did it from data that have different variables. for example the force applied to a spring and the extension of the spring? so force would be the x value and extension would be the y value.
    You can if you wish. Spearman's rank correlation coefficient simply measures how well the relationship between two variables can be described by a monotonic function. The coefficient takes on the value +1 or -1 if the relationship is perfectly monotone.

    However, the example you give is probably not a good one: there would have to be an awful lot of "noise" in the spring system for the relationship between force and extension to not be perfectly monotone!
 
 
 
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