Method for printing objects of class power_array. ##' Prints a power_array as a default array with a short summary about its contents.
Usage
# S3 method for class 'power_array'
print(x, ...)Examples
## Define grid of assumptions to study:
sse_pars = list(
n = seq(from = 10, to = 50, by = 20), # sample size
delta = seq(from = 0.5, to = 1.5, by = 0.5), # effect size
sd = seq(.1, 1, .3)) # standard deviation
## Define function that calculates power based on these assumptions:
PowFun <- function(n, delta, sd){
ptt = power.t.test(n = n/2, delta = delta, sd = sd,
sig.level = 0.05)
return(ptt$power)
}
## Evaluate at each combination of assumptions:
powarr = PowerGrid(pars = sse_pars, fun = PowFun, n_iter = NA)
print(powarr)
#> , , sd = 0.1
#>
#> delta
#> n 0.5 1 1.5
#> 10 0.9999993 1.0000000 1.0000000
#> 30 1.0000000 1.0000000 1.0000000
#> 50 1.0000000 1.0000000 1.0000000
#>
#> , , sd = 0.4
#>
#> delta
#> n 0.5 1 1.5
#> 10 0.4129428 0.9315752 0.9992276
#> 30 0.9104815 0.9999982 1.0000000
#> 50 0.9910928 1.0000000 1.0000000
#>
#> , , sd = 0.7
#>
#> delta
#> n 0.5 1 1.5
#> 10 0.1681223 0.5103278 0.8420422
#> 30 0.4716852 0.9652339 0.9998914
#> 50 0.6965931 0.9985937 1.0000000
#>
#> , , sd = 1
#>
#> delta
#> n 0.5 1 1.5
#> 10 0.1038399 0.2859276 0.5493642
#> 30 0.2619313 0.7529210 0.9774319
#> 50 0.4099896 0.9337076 0.9993912
#>
#> Array of class `power_array` created using
#> PowerGrid.
#> Resulting dimensions:
#> n, delta, sd.
#>