Qiaoyuan Zhi

3 Questions 7 Answers 0 Followers

Questions related from Qiaoyuan Zhi

[Effect Size Estimation] Can I use a smaller sample size to estimate an effect size for a larger scale study?

Hello. I am calculating the sample size needed for a study. The effect size is one input parameter for the calculation. However, there is not much relevant literature allowing me to estimate the...

28 January 2021 4,486 6 View

Avoid Sample Bias: How many subjects do we need for the underrepresented categories?

Hello, We have a 3*3*2*2*2*2*3*3= 3^4*2^4 (i.e. Total eight factors: four factors with two levels each, and four factors with three levels each) design. One of our factors is Age, which has three...

13 October 2020 6,491 2 View

How to use a mixed level fractional factorial design?

Hello, I have a 3*3*2*2*2*2*3*3= 3^4*2^4 (i.e. Total eight factors: four factors with two levels each, and four factors with three levels each). To get a small effect size in regression, the...

10 September 2020 2,097 10 View