:TINV function calculation degree of freedom two-tailed probability interval point-Table skills免费ppt模版下载-道格办公

TINV function calculation degree of freedom two-tailed probability interval point

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Returns the t-value of the Student's t distribution as a function of probability and degrees of freedom.

Grammar

TINV(probability,degrees_freedom)

Probability corresponds to the probability of a two-tailed Student's t distribution.

Degrees_freedom The numerical degrees of freedom of the distribution.


Description

If any parameter is non-numeric, TINV returns the #VALUE! error value.

■probability

■If degrees_freedom is not an integer, it will be truncated.

■If degrees_freedom < 1, TINV returns the #NUM! error value.

TINV returns the t value, P(|X| > t) = probability, where X is a random variable obeying t distribution, and P(|X| < span style="">> t) = P(X < -t or X > t).

One-tailed t-values ​​are found by replacing the probability with twice the probability. If the probability is 0.05 and the degrees of freedom are 10, the two-tailed value is calculated by TINV(0.05,10)

Get, it returns 2.28139. The one-tailed value for the same probability and degrees of freedom can be calculated by TINV(2*0.05,10), which returns 1.812462.

Note:In some tables, the probability is described as (1-p).

If a probability value is given, TINV solves for the value x using TDIST(x, degrees_freedom, 2) = probability.

Therefore, the accuracy of TINV depends on the accuracy of TDIST. TINV uses an iterative search technique.

If the search does not converge after 100 iterations, the function returns the #N/A error value.

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