Will MATLAB function samplesizepwr work with paired t-test

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!

Answer 1

[the cyclist]

I read through the documentation, and I don't see any mention of calculating power for a paired t-test. Maybe there is a way, but it is not clear to me.

FYI, I will often use the free program G*Power to calculate statistical power. I have checked it against MATLAB is equivalent cases, and I have confidence in it.

[Padma Naveena Ganapam]

Thank you! Will have a look