n_2t_unequal: Calculate Per-Group Sample Size for Two-Sample Unequal...
In dvmisc: Convenience Functions, Moving Window Statistics, and Graphics

Description Usage Arguments Value Examples

Unequal variance version of n_2t_equal. Assumes an equal sample size for both groups, which is actually not optimal.

1	n_2t_unequal(d, sigsq1, sigsq2, alpha = 0.05, beta = 0.2)

`d`	Numeric value specifying true difference in group means.
`sigsq1, sigsq2`	Numeric value specifying the variance of observations in each group.
`alpha`	Numeric value specifying type-1 error rate.
`beta`	Numeric value specifying type-2 error rate.

Numeric value indicating per-group sample size, rounded up to the nearest whole number.

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# Per-group sample size for 90% power to detect difference of 0.2 with
# sigsq's of 1 and 1.25
n_2t_unequal(d = 0.2, sigsq1 = 1, sigsq2 = 1.25, beta = 0.1)