how to model fixed effects in logistic regression what model can you use to find the difference between a control intervention and retest how do we add different measures to our model? can you add multiple variables and predict treatment how to calculate variable for retesting placebo when you need to add a fixed effect to your experiment what is this used for when estimating fixed effects what is the equation when is meant to be a fixed effect why is it necessary to include multiple groups how to calculate a fixed effect when you have multiple fixed effects for each treatment group calculating the fixed effect for placebo how to model for placebo groups how to add multiple covariates to a controlled trial can you have multiple groups in one intervention how to add multiple covariates in retest group how to find fixed effects what is the purpose of having a fixed effect which type of data is used to model the mixed effect why is there a multiple variable for each fixed effect?