Q function (inverse) and erf(c) inverse in CAS
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07-22-2024, 04:52 PM
(This post was last modified: 07-22-2024 06:05 PM by nbc12.)
Post: #1
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Q function (inverse) and erf(c) inverse in CAS
I'm doing a statistics class this summer, and the CAS on the Prime has been a huge help!
I noticed that the Prime doesn't have these MATLAB functions that we use in class: qfunc (Q function) qfuncinv (Inverse Q function) erfinv (Inverse ERF) erfcinv (Inverse ERFC) So I created a CAS program to give me them. Code:
Feel free to use as you wish. I'm mostly just putting this here so some future stats student can just grab the program. Maybe these could be included in a future update? It would be helpful to me at least ![]() |
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07-22-2024, 05:50 PM
Post: #2
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RE: Q function (inverse) and erf(c) inverse in CAS
(07-22-2024 04:52 PM)nbc12 Wrote: erfcinv(x):=normald_icdf((x/2)/-√(2)); Typo. Should be: erfcinv(x) := normald_icdf(x/2) / -√(2); Quote:qfunc(x):=(1/2)*erfc(x/√(2)) Nothing wrong with these, but perhaps simpler with cdf / icdf qfunc(x) := normald_cdf(-x); qfuncinv(x) := -normald_icdf(x); |
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07-22-2024, 06:06 PM
Post: #3
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RE: Q function (inverse) and erf(c) inverse in CAS
(07-22-2024 05:50 PM)Albert Chan Wrote:(07-22-2024 04:52 PM)nbc12 Wrote: erfcinv(x):=normald_icdf((x/2)/-√(2)); Good catch, I changed the original post to match. And yes, you are right, it is much simpler using cdf and icdf! |
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