MATLAB: How can i calculate inverse of standard normal cumulative distribution function in matlab

inverse of standard normal distribiutionstatistics

hi i need to use inverse of standard normal cumulative distribution function in Matlab ,Can anyone let me know that how can i do this? can i use norminv ???

Best Answer

Why wold you not use norminv if you have it? The first line of the help reads:

"norminv Inverse of the normal cumulative distribution function (cdf)."

Read the help.

For those who lack norminv (thus the stats toolbox) this reduces to a simple transformation of erfcinv.

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MATLAB: Plotting standard normal rvs

If you have the Statistics Toolbox, then this is extremely easy, just using the normpdf function which encodes the formula for you.

MU    = 10;
SIGMA = 1;
x = 5 : 0.01 : 15;
y = normpdf(x,MU,SIGMA)
figure
plot(x,y)

If you don't have the toolbox, then just use

y =1./sqrt(2*pi*SIGMA) * exp(-(x-MU).^2 /(2 * SIGMA));

instead.

MATLAB: How to plot a probability distribution object

Use the pdf function:

pd = makedist('Normal','mu',75,'sigma',10);
x = 25:125;
y = pdf(pd, x);
figure
plot(x,y)
grid

Best Answer

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MATLAB: Plotting standard normal rvs

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