		F DISTRIBUTION CRITICAL VALUE

Michael Lloyd (http://www.hsu.edu/faculty/lloydm/ti/prgmtabl.html)
Henderson State University


DESCRIPTION
Assume that the random variable F has the F distribution.  Given
the right tail area A and the degrees of freedom, the critical value 
f is found so that P[ F > f ] = A.  Reference: "Probability and 
Statistical Inference" by Hogg and Tanis, 4th Edition, p. 685.

INSTRUCTIONS
1. Enter the area in the right tail.
2. Enter the degrees of freedom of the numerator.
3. Enter the degrees of freedom of the denominator.
4. The critical F vlaue will be displayed.

VERSION HISTORY
1.0 - December 1996 - original version 
1.1 - April 1997 - improved
1.2 - April 1999 - improved
1.3 - January 2006 - renamed from FVAL to INVF to make the name more
	consistent with the TI-89 APP function
1.4 - March 2007 - added copyright
1.5 - August 2015 - updated file to .8xp

VARIABLES USED
C = area under pdf
D = used
F = critical value
M = degrees of freedom of the numerator
N = degrees of freedom of the denominator
P = x scale
Q = tolerance
prgmZZINEWT subroutine

++++++++++++++++++++++++++++++++++++++++++++++++++++++
PROGRAM LISTING

Disp "VERSION 1.4","(C)2007 M LLOYD"
Input "RT TAIL AREA=",C
If C\>=\.5
Then
Disp "AREA MUST BE <.5"
Stop
End
1-C\->\C
Input "NUMERATOR DF=",M
Input "DENOMINATOR DF=",N
"\F\pdf(X,M,N)"\->\Y\0\
1\->\P
.01\->\Q
prgmZZINEWT
T\->\F
Disp "F=",F
DelVar Y\0\