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function [ex cv cs]=P3ML(data)
n=length(data);
exi=mean(data);
csi=sum((data-exi).^3)*n/(n-1)/(n-2)/(sum((data-exi).^2)/(n-1))^1.5;
a2i=4/csi^2;
a1i=sqrt(var(data)/a2i);
a3i=mean(data)-sqrt(var(data)*a2i);
x0=[a1i a2i a3i];
options=optimset('MaxFunEvals',5000,'MaxIter',1000,'Display','iter','LargeScale','on','tolfun',1e-6,'tolx',1e-2);
x=fsolve(@(x)fun(x,data,n),x0,options);
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