size.ci.slope.gen {statpsych} | R Documentation |
Sample size for a slope confidence interval in a general statistical model
Description
Computes the sample size required to estimate a slope coefficient with desired confidence interval precision in any general statistical model. This function requires a standard error estimate for the slope of interest from a prior or pilot study and the sample size that was used in the prior or pilot study.
Usage
size.ci.slope.gen(alpha, se, n0, w)
Arguments
alpha |
alpha level for 1-alpha confidence |
se |
standard error of slope from prior/pilot study |
n0 |
sample size used in prior/pilot study |
w |
desired confidence interval width |
Value
Returns the required sample size
Examples
size.ci.slope.gen(.05, 3.15, 50, 5)
# Should return:
# Sample size
# 305
[Package statpsych version 1.7.0 Index]