Created
December 14, 2017 13:03
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Power estimates for differing SDs
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parameter_grid <- expand.grid(n = c(32, 64), | |
d = seq(0.05, 2, by = 0.05), | |
sd = seq(1, 2, by = 0.2)) | |
parameter_grid$power <- power.t.test(n = parameter_grid$n, delta = parameter_grid$d, sd = parameter_grid$sd)$power | |
library(tidyverse) | |
parameter_grid$n <- paste(parameter_grid$n, "pro group") | |
ggplot(parameter_grid, | |
aes(x = d, | |
y = power, | |
colour = factor(sd))) + | |
geom_line() + | |
xlab("mean difference in population") + | |
scale_colour_brewer(name = "Population SD", | |
palette = "Dark2") + | |
facet_wrap(~ n) + | |
theme_bw(12) + | |
theme(legend.position = "bottom") |
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