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Just a note

The following code produces a quantile-quantile plot using R.

  • You can use qqplot to produce a QQ plot of two datasets. This is comparison of two sample distributions - no comparison is being made to any theoretical distribution.

  • In this example sample sizes are the same so there is no interpolation. If sample sizes differ, the values of the appropriate quantiles are interpolated.

  • If sample sizes are different, equivalent quantiles to those in the smaller sample are interpolated in the larger sample.