update {sse} | R Documentation |
A function for updating an existing object of class powCalc or power.
update(object, ...)
object |
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... |
The following elements (slots) of the object can be updated:
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An object of class powCalc.
Be careful if you use this function to update objects of class power.
powCalc
for geneating new objcets of class
powCalc.
## defining the range of n and theta to be evaluated psi <- powPar(theta = seq(from = 0.5, to = 1.5, by = 0.1), n = seq(from = 20, to = 60, by = 2), muA = 0, muB = 1) ## defining a power-function powFun <- function(psi){ power.t.test(n = n(psi)/2, delta = pp(psi, "muA") - pp(psi, "muB"), sd = theta(psi) )$power } ## evaluating the power-function for all combinations of n and theta calc <- powCalc(psi, powFun) ## updating by using additional elements for "n" calc2 <- update(calc, n = seq(from = 20, to = 90, by = 2)) ## adding example at theta of 1 and power of 0.9 pow <- powEx(calc2, theta = 1, power = 0.9) ## drawing the power plot with 3 contour lines plot(pow, xlab = "Standard Deviation", ylab = "Total Sample Size", at = c(0.85, 0.9, 0.95))