
F LOCATION TESTName:
More formally, the F location test is defined as:
where <y> is the response variable; <groupid> is group (sample) identifier variable; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
F LOCATION TEST Y1 GROUP SUBSET GROUP > 2
STATCDF = F CDF value of F location test statistic CUTOFF0 = F percent point value (p=0) CUTOFF50 = F percent point value (p=.50) CUTOFF75 = F percent point value (p=.75) CUTOFF90 = F percent point value (p=.90) CUTOFF95 = F percent point value (p=.95) CUTOFF99 = F percent point value (p=.99) CUTOF999 = F percent point value (p=.999) Some of these parameters were not saved correctly in versions of Dataplot prior to 2000/9.
SKIP 25 READ VANGEL32.DAT Y X B SET WRITE DECIMALS 5 F LOCATION TEST Y XThe following output is generated: FTest for Shift in Location (Assumption: Normality) Response Variable: Y GroupID Variable: X H0: Groups are Homogeneous with Respect to Location Ha: Groups are Not Homogeneous with Respect to Location Summary Statistics: Total Number of Observations: 45 Number of Groups: 3 F Location Test Statistic Value: 45.30680 CDF of Test Statistic: 1.00000 PValue: 0.00000 Percent Points of the F Reference Distribution  Percent Point Value  0.0 = 0.000 50.0 = 0.705 75.0 = 1.433 90.0 = 2.434 95.0 = 3.220 97.5 = 4.033 99.0 = 5.149 99.9 = 8.179 Conclusions (Upper 1Tailed Test)  Alpha CDF Critical Value Conclusion  10% 90% 2.434 Reject H0 5% 95% 3.220 Reject H0 2.5% 97.5% 4.033 Reject H0 1% 99% 5.149 Reject H0  
Date created: 06/05/2001 Last updated: 12/11/2023 Please email comments on this WWW page to alan.heckert@nist.gov. 