The Excel FINV function calculates the inverse of the (right-tailed) F Probability Distribution for a supplied probability.
Syntax: FINV( probability, deg_freedom1, deg_freedom2 )
|probability||–||The probability (between 0 and 1) at which to evaluate the inverse F Probability Distribution|
|deg_freedom1||–||An integer specifying the numerator degrees of freedom|
|deg_freedom2||–||An integer specifying the denominator degrees of freedom|
If either deg_freedom1 or deg_freedom2 are decimal numbers, these are truncated to integers by Excel. The Excel Finv function is the inverse of the Excel FDIST function.
|FDIST( x, deg_freedom1, deg_freedom2 ) = probability|
|x = FINV( probability, deg_freedom1, deg_freedom2 )|
Finv Function Example
The chart on the right shows the inverse of the right-tailed F Probability Distribution with the numerator degrees of freedom equal to 1 and the denominator degrees of freedom equal to 2. If you want to use Excel to calculate the value of this function for a probability equal to 0.2, this can be done by the Finv function, as follows:
=FINV( 0.2, 1, 2 )
This gives the result 3.555555556.
Finv Function Common Errors
If you get an error from the Excel Finv function this is likely to be one of the following :
|#NUM!||–||Occurs if either the supplied probability value is ≤ 0 or > 1 or the supplied deg_freedom1 or the deg_freedom2 argument is < 1 or ≥ 10^10|
|#VALUE!||–||Occurs if any of the supplied arguments are non-numeric|