[R] Inverse Student t-value

[Andre]

Dear Sir/Madam,

I am trying to use calculation for two-tailed inverse of the student`s
t-distribution function presented by Excel functions like
=TINV(probability, deg_freedom).

For instance: The Excel function =TINV(0.0000408831,1221) =  returns
 4.0891672.

Would you like to show me a manual calculation for this?

Appreciate your helps in advance.


Cheers!  Andre

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