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matlabdistributionquantile

Computing Quantile in MATLAB

Is there any built-in function in MATLAB to compute

0.025th quantile of Binomial distribution with parameter n=60 and p=0.4

0.975 quantile of standard normal distribution ?

Solution

  • Do you have the Statistics toolbox? If yes,

    >> binoinv(.025,60,.4)

ans =

    17

>> norminv(.975,0,1)

ans =

    1.9600

    If not, you could use the following equivalences:

    • The inverse normal CDF can be expressed in terms of the erfinv function
    • The binomial CDF can be expressed in terms of the betainc function