Error in eval(predvars, data, env) : object 'avg' not found

That error usually implies you don’t have an object (or column in a data frame) named ‘avg’, your line of code also didn’t mention avg.

It would help if you asked this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.

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