Here is the typical setup to do an extreme value analysis on MATLAB:

Load (City Name) – .csv files will be created for all cities included in the study
m = (1:No. of Annual Max);
N = No. of Annual Max;
Pv = (m-0.44)/(N+0.12);
x = -log(-log(Pv(1:No. of Annual Max));
plot (City Name',x)

Once the graph is created, you can fit linear interpolation to it.

Go to "Tools"? "Basic Fitting" ? Linear

	Check "Show Equations" box, and bring it out to 5 significant digits
	Go to "Find Y=f(X)" and type in 4.600149 to evaluate f(X) for an 100-year wind.

Other aesthetic changes can be made from the toolbar at the top of the graphical 
representation.