pwr.f2.test

0th

Percentile

Power calculations for the general linear model

Compute power of test or determine parameters to obtain target power (same as power.anova.test).

Keywords
htest
Usage
pwr.f2.test(u = NULL, v = NULL, f2 = NULL, sig.level = 0.05, power = NULL)
Arguments
u

degrees of freedom for numerator

v

degrees of freedomfor denominator

f2

effect size

sig.level

Significance level (Type I error probability)

power

Power of test (1 minus Type II error probability)

Details

Exactly one of the parameters 'u','v','f2','power' and 'sig.level' must be passed as NULL, and that parameter is determined from the others. Notice that the last one has non-NULL default so NULL must be explicitly passed if you want to compute it.

Value

Object of class '"power.htest"', a list of the arguments (including the computed one) augmented with 'method' and 'note' elements.

Note

'uniroot' is used to solve power equation for unknowns, so you may see errors from it, notably about inability to bracket the root when invalid arguments are given.

References

Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale,NJ: Lawrence Erlbaum.

Aliases
  • pwr.f2.test
Examples
# NOT RUN {
## Exercise 9.1 P. 424 from Cohen (1988) 
pwr.f2.test(u=5,v=89,f2=0.1/(1-0.1),sig.level=0.05)
# }
Documentation reproduced from package pwr, version 1.2-2, License: GPL (>= 3)

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