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A doctor suggests to me to perform an ANCOVA with multiple covariates...but i don't understand 1) the differences between ANCOVA and TWO WAY ANOVA with interaction and 2) differences between ANCOVA and PLS regression. Sorry but it is the first time for me with these models

because they are child patients and measuring intolerance on them is complicated. They come from a small Hospital

in fact I didn't think it made sense but I wasn't sure. however, do you think there would be another type of analysis to be performed on only 11 patients to understand if the severity of the disease can have an effect on the speed of growth?

Sorry for mistake, i have two groups: treated and not, the treated group consist in children intollerant to lactos and the control are not intollerant. So i would like to investigate if into the treat group the gravity of intollerance, bmi,age and sex influence the speed of growth but i have...

It might have sens to perform a multiple linear regression on 11 patients to understand if the symptoms influence the speed of growth?

Hello everyone, I should do a learning curve but first I have to calculate the sample size. I have only one group and I have to see if patients improve their learning over time. The literature calculates a sample of 7 people with 26% SD and an increase of 10%. It is the first time for me and i'm...