Thank you very much for your guidance and advice once again.
This has allowed me to experience the power of SAS once more, particularly its rigorous mathematical system, as well as the expertise of top-level professionals in the SAS community such as yourself.
Honestly, we usually calculate sample sizes using PASS software, but many aspects of this software are not explained clearly, such as the mathematical formulas for complex analysis methods including repeated measures analysis, GLMM, GLM, GEE, mixed effects models, survival analysis, and so on.
Additionally, PASS software generally only provides calculation formulas for power, and hardly ever provides direct sample size calculation formulas. All of this makes it difficult for us to fully understand the process of sample size calculation, and we cannot be completely confident in the calculation results.
SAS is relatively clear in this aspect. We will study your content carefully, and every answer you give benefits us greatly.
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