Hi,
A quantile-quantile plot (qq-plot) does not require to fit a specific distribution.
>> qqplot(x,y)
The above function from the Statistics and Machine Learning Toolbox in MATLAB creates a quantile-quantile plot, comparing the quantiles of sample data ‘x’ with the quantiles of sample data ‘y’. If the samples are from the same distribution, the plot will show a linear relationship.
When ‘x’ and ‘y’ are matrices in MATLAB, the ‘qqplot’ function displays a separate line for each pair of corresponding columns. It compares the quantiles of each column in ‘x’ with the quantiles of the corresponding column in ‘y’.
For more information on ‘qqplot’ you can refer to the documentation: https://in.mathworks.com/help/stats/qqplot.html
Hope it helps!
