at what level do you standardize variables how do you standardize variables for a test at what level do you standardize variables does standardizing variables make a difference? when to standardize covariant what level to standardize how to standardize variables between grades standardization of variables in grade how many variables is a standardization variable what is the difference between standardization and standardization in data quality standardizing variable vs. standardization within grade what level is standardization do you standardize in terms of ra can i standardize in 12th grade when should you standardize variables within grade does standardizing at index level make a difference does standardization in data mean in grades at what level should you standardize the variables? does standardization take place within grade standardization in what grade do you use the data in a model?