Power analysis - several measurements per individual

[#1]

Hello everybody,

I have an experiment with several measurements per individual of each sample. I would like to study the impact on the sample size and also the number of measurements per individual on the power and difference that can be detected between two samples. I wanted to use the platform Sample Size and Power - Two Sample Means, but if I am not wrong it doesn't allow to take into account the number of measurements per individual. Is there another tool or maybe script that I could use to investigate this question?

Thanks for your help!

[#2]

just to reiterate, you should really look at the within fruit data before just taking the mean.  Is it consistent?  Are there any unusual points?  If it is consistent and there are not any unusual points, then the mean will be an appropriate statistic.  You might also want the standard deviation as that represents within fruit variation.  You might find factors that effect variability (vs. just the mean).

[#3]

You are right @statman, since there are quite variability between the different measurements, taking just the mean may not be the best option to catch all information. Keeping the raw data or adding the standard deviation, as you suggest, can be relevant.