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theoric vs empiric PDF & CDF

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jean claude
jean claude 2017-12-5
关闭： MATLAB Answer Bot 2021-8-20
hello guys, i want to know if there is a better way to compare the empiric PDF to the theoric PDF of a normal distribution sample (i know that histfit is a good way but my goal is to have two curves in the same plot), same thing for CDF. So i have a time series data x (1 column vector) and i want to see how it matchs with the normal distribution
%%PDF
xval = min(x):.01:max(x);
[muhat,sigmahat] = normfit(x);
yval = normpdf(xval,muhat,sigmahat);
plot(xval,yval) %theoric PDF
hold on
ksdensity(x) %empirical PDF
%%CDF
xval = min(x):.01:max(x);
f = evcdf(xval,muhat,sigmahat);
plot(xval,f,'m') %theoric CDF
hold on
cdfplot(x) %empirical CDF

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