search for: treatment_type

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Did you mean: treament_type
2009 Apr 02
1
help with two layers of factors
I have a data frame that looks something like... Column 1 is an experiment_id, Column 2 is the type of treatment ("control", "full treatment", or "partial treatment"), and Column 3 is a value. Experiment_id Treament_type Value 12345 "control" 3 12345 "full treatment" 4 12345 "full treatment" 5 12345 "partial