Hello
I want to do sample size and power analysis. I am confused about using the function samplesizepwr with a paired t-test.
in the help section for the samplesizepwr function the input arguments for the test type are:
Test type, specified as one of the following.
- 'z' — z-test for normally distributed data with known standard deviation.
- 't' — t-test for normally distributed data with unknown standard deviation.
- 't2' — Two-sample pooled t-test for normally distributed data with unknown standard deviation and equal variances.
- 'var' — Chi-square test of variance for normally distributed data.
- 'p' — Test of the p parameter (success probability) for a binomial distribution. The 'p' test is a discrete test for which increasing the sample size does not always increase the power. For n values larger than 200, there may exist values smaller than the returned n value that also produce the specified power.
My data is a paired t-test does the test type t2 still apply in this case?
Please throw some light on this.
Thank you!
