I am trying to find the cumulative distribution function of the standard normal. I have the value that I will be using the cdf to analyze but cannot figure out the functions to go with it. Can anyone help me find the correct functions/code?

Below is the code I attempted to run..but it isn't recognizing the makedist function.

x = 0.24 mu = 0 sigma = 1

pd = makedist('Normal')

y = cdf(pd,x)

Answer 1

[Roger Stafford]

Use matlab's 'erfc' function in place of 'normcdf' if you don't have the Statistics Toolbox according to the formula:

 normcdf(x) = 1/2*erfc(-x/sqrt(2))

[Kylie]

This worked! thanks!

Answer 2

[dpb]

Seems makedist is new after R2012b 'cuz it ain't here at the release.

Use

 normcdf() % and friends

instead

[Kylie]

I have tried that..so the code is: x = 0.24 mu = 0 sigma = 1

normcdf(x)

and this is the error message I get back:

??? Undefined function or method 'normcdf' for input arguments of type 'double'.

Error in ==> untitled7 at 5 normcdf(x)

[dpb]

Apparently you don't have the Statistics Toolbox installed (or installed correctly, anyway).

What does

ver

return? Will list installed toolboxen and versions.