what is the function which calculate the area under curve like ''normspec '' ?

I am using a different probability distribution to fit a data but the tail didn't() reach zero (at x-axis)

I want to determine the 99% of the area under curve of this probability ditribution.

I use this code to produce the figure:

paramEsts = gevfit(data); %estimate parameter
xgrid = linspace(0,18,100);
pdfEst = gevpdf(xgrid,paramEsts(1),paramEsts(2),paramEsts(3)); hold on;
line(xgrid,pdfEst,'color','r')

when I was fitting the normal distribution. I got the value of 99% of the curve using:

 p= normspec([6.5,inf],mu,sigma);

but I didn't know how to get it with generalized extreme value distribution?

[Amr Hashem]

any suggestion ...!

Answer 1

[Torsten]

x = gevinv(0.01,paramEsts(1),paramEsts(2),paramEsts(3));

gives you the 99% x-value.

Best wishes

Torsten.