On 30/09/2014 1:31 PM, Andre wrote:
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.
That number looks pretty far off the true value. Have you got a typo in
your example?
You can compute the answer to your question as abs(qt(0.0000408831/2,
df=1221)), but you'll get 4.117.
Duncan Murdoch
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