What is being attempted with this particular 'Q-Q plot'?

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What is being attempted with this particular 'Q-Q plot'?




Could someone kindly explain what exactly is being plotted in the ‘Q-Q plot’ generated by choosing the option ‘Normality plots with tests’ from the SPSS menu sequence Anlalyze à Descriptive Statistics à Explore. The corresponding command is NPPLOT.


Please do not send me a definition of a Q-Q plot. This is not needed.  I am referring to a specific routine and see neither the rationale nor an accessible explanation to hand. I have looked up an algorithm, but this does not answer my questions.


Thanks in advance for a clear answer, if available.


Many thanks

Best wishes



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