how to find variables that are measured in varying numbers why is it important to use statistics how does a data model work for the variable what is the model of variable range do you test the model to see if a statistic is valid for multiple variables how is the statistic used to describe a variable what are the assumptions in the statistics of variables how to model variables in statistics why would it be difficult to use the same time for multiple variables in regression can a linear model include a variable that is measured in different time points which method assumes that a variable is measured the same amount of time and at the same point in time? what's a model for a variable in data science which model assumes each data variable is measured twice, and that each person is measured twice, at a certain point in time how to plot variables in time what is model of the variable when you use a zero multiplied poisson model what does the individual mean in the model? how is time different in a data model what model is used to describe variables with variable count how to model a variable that is measured multiple times how can i model a variable