This function will take a single variable and return the centered version of that variable. It can be used with the grouping parameter set to 'person_id' to get person-centered variables.
1  | center_cols(data, variables, grouping)
 | 
data | 
 The dataset to operate on.  | 
variables | 
 The character vector of variables to lag  | 
grouping | 
 The character vector of grouping variables  | 
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