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A Q–Q plot (or quantile quantile plot) is a scatterplot of the quantiles of two distributions. Q–Q plots are useful for comparing distributions.

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QQ Plot Reference Line not 45°

I was plotting (standardized) return data with qqplot() in MATLAB against the theoretical quantiles of a normal distribution. However, the line in the QQ-Plot does not have a 45° angle but is rotated …
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