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labda
2004 Sep 23
1
noncentrality paramter in power.anova.test (PR#7244)
...ared a few power computations using the new lambda to values
from a text on power. The new lambda produces more correct values for power.
groups <- 3
n <- 5
between.var <- 10.295
within.var <- 1
sig.level <- 0.05
#The first, incorrect lambda is used in power.anova.test
#incorrect labmda
lambda <- (groups - 1) * n * (between.var/within.var)
pf(qf(sig.level, groups - 1, (n - 1) * groups, lower = FALSE),
groups - 1, (n - 1) * groups, lambda, lower = FALSE)
#This correct lambda should be used instead
lambda <- (groups - 1) * (between.var/within.var)
pf(qf(sig.level...